Neidio i'r cynnwys
Darparwr data: Llywodraeth Cymru Ystadegau Gwladol Traffig ffyrdd yn ôl Awdurdodau Lleol a blwyddyn heb gynnwys cefnffyrdd (biliwn o gilomedrau cerbydau)
None
Galwch heibio Caeau Hidlo Yma
Measure2
Blwyddn(Disgynnol)[Hidlo]
[Lleihau]Awdurdod lleol[Hidlo]
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[Lleihau]Awdurdod lleol 1
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Awdurdod lleol 2
Cliciwch yma i ddidoli2022Cliciwch yma i ddidoli2021Cliciwch yma i ddidoli2020Cliciwch yma i ddidoli2019Cliciwch yma i ddidoli2018Cliciwch yma i ddidoli2017Cliciwch yma i ddidoli2016Cliciwch yma i ddidoli2015Cliciwch yma i ddidoli2014Cliciwch yma i ddidoli2013Cliciwch yma i ddidoli2012Cliciwch yma i ddidoli2011Cliciwch yma i ddidoli2010Cliciwch yma i ddidoli2009Cliciwch yma i ddidoli2008Cliciwch yma i ddidoli2007
[Lleihau]Cymru18.2717.0515.46(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.19.28(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.19.11(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.18.84(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.18.87(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.18.14(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.17.72(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.16.91(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.16.94(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.16.85(r) Mae\'r eitem ddata hon wedi\'i diwygio ers ei chyhoeddi\'n wreiddiol yn StatsCymru.16.7716.9617.3017.50
Cymru[Lleihau]Gogledd CymruYnys Môn0.430.400.37(r) The data item has been revised since previously published in StatsWales.0.46(r) The data item has been revised since previously published in StatsWales.0.46(r) The data item has been revised since previously published in StatsWales.0.46(r) The data item has been revised since previously published in StatsWales.0.46(r) The data item has been revised since previously published in StatsWales.0.44(r) The data item has been revised since previously published in StatsWales.0.43(r) The data item has been revised since previously published in StatsWales.0.42(r) The data item has been revised since previously published in StatsWales.0.43(r) The data item has been revised since previously published in StatsWales.0.43(r) The data item has been revised since previously published in StatsWales.0.430.440.440.44
Gwynedd0.720.680.62(r) The data item has been revised since previously published in StatsWales.0.79(r) The data item has been revised since previously published in StatsWales.0.79(r) The data item has been revised since previously published in StatsWales.0.79(r) The data item has been revised since previously published in StatsWales.0.79(r) The data item has been revised since previously published in StatsWales.0.75(r) The data item has been revised since previously published in StatsWales.0.73(r) The data item has been revised since previously published in StatsWales.0.70(r) The data item has been revised since previously published in StatsWales.0.70(r) The data item has been revised since previously published in StatsWales.0.71(r) The data item has been revised since previously published in StatsWales.0.710.720.730.73
Conwy0.550.520.48(r) The data item has been revised since previously published in StatsWales.0.59(r) The data item has been revised since previously published in StatsWales.0.58(r) The data item has been revised since previously published in StatsWales.0.58(r) The data item has been revised since previously published in StatsWales.0.57(r) The data item has been revised since previously published in StatsWales.0.55(r) The data item has been revised since previously published in StatsWales.0.54(r) The data item has been revised since previously published in StatsWales.0.52(r) The data item has been revised since previously published in StatsWales.0.52(r) The data item has been revised since previously published in StatsWales.0.52(r) The data item has been revised since previously published in StatsWales.0.520.520.530.53
Sir Ddinbych0.570.520.48(r) The data item has been revised since previously published in StatsWales.0.60(r) The data item has been revised since previously published in StatsWales.0.60(r) The data item has been revised since previously published in StatsWales.0.60(r) The data item has been revised since previously published in StatsWales.0.60(r) The data item has been revised since previously published in StatsWales.0.58(r) The data item has been revised since previously published in StatsWales.0.58(r) The data item has been revised since previously published in StatsWales.0.57(r) The data item has been revised since previously published in StatsWales.0.57(r) The data item has been revised since previously published in StatsWales.0.57(r) The data item has been revised since previously published in StatsWales.0.570.570.580.58
Sir y Fflint0.960.900.82(r) The data item has been revised since previously published in StatsWales.1.03(r) The data item has been revised since previously published in StatsWales.1.03(r) The data item has been revised since previously published in StatsWales.1.02(r) The data item has been revised since previously published in StatsWales.1.03(r) The data item has been revised since previously published in StatsWales.0.98(r) The data item has been revised since previously published in StatsWales.0.97(r) The data item has been revised since previously published in StatsWales.0.93(r) The data item has been revised since previously published in StatsWales.0.93(r) The data item has been revised since previously published in StatsWales.0.93(r) The data item has been revised since previously published in StatsWales.0.930.950.970.98
Wrecsam0.660.620.56(r) The data item has been revised since previously published in StatsWales.0.69(r) The data item has been revised since previously published in StatsWales.0.69(r) The data item has been revised since previously published in StatsWales.0.69(r) The data item has been revised since previously published in StatsWales.0.68(r) The data item has been revised since previously published in StatsWales.0.66(r) The data item has been revised since previously published in StatsWales.0.64(r) The data item has been revised since previously published in StatsWales.0.61(r) The data item has been revised since previously published in StatsWales.0.61(r) The data item has been revised since previously published in StatsWales.0.61(r) The data item has been revised since previously published in StatsWales.0.610.620.620.63
[Lleihau]Canolbarth CymruPowys0.830.790.73(r) The data item has been revised since previously published in StatsWales.0.90(r) The data item has been revised since previously published in StatsWales.0.86(r) The data item has been revised since previously published in StatsWales.0.86(r) The data item has been revised since previously published in StatsWales.0.85(r) The data item has been revised since previously published in StatsWales.0.79(r) The data item has been revised since previously published in StatsWales.0.78(r) The data item has been revised since previously published in StatsWales.0.75(r) The data item has been revised since previously published in StatsWales.0.75(r) The data item has been revised since previously published in StatsWales.0.75(r) The data item has been revised since previously published in StatsWales.0.770.780.790.78
Ceredigion0.490.470.43(r) The data item has been revised since previously published in StatsWales.0.53(r) The data item has been revised since previously published in StatsWales.0.53(r) The data item has been revised since previously published in StatsWales.0.53(r) The data item has been revised since previously published in StatsWales.0.53(r) The data item has been revised since previously published in StatsWales.0.49(r) The data item has been revised since previously published in StatsWales.0.49(r) The data item has been revised since previously published in StatsWales.0.47(r) The data item has been revised since previously published in StatsWales.0.47(r) The data item has been revised since previously published in StatsWales.0.47(r) The data item has been revised since previously published in StatsWales.0.480.490.490.49
[Lleihau]De-ddwyrain CymruPen-y-bont ar Ogwr0.920.860.77(r) The data item has been revised since previously published in StatsWales.0.97(r) The data item has been revised since previously published in StatsWales.0.96(r) The data item has been revised since previously published in StatsWales.0.92(r) The data item has been revised since previously published in StatsWales.0.92(r) The data item has been revised since previously published in StatsWales.0.88(r) The data item has been revised since previously published in StatsWales.0.86(r) The data item has been revised since previously published in StatsWales.0.82(r) The data item has been revised since previously published in StatsWales.0.81(r) The data item has been revised since previously published in StatsWales.0.80(r) The data item has been revised since previously published in StatsWales.0.790.790.800.82
Bro Morgannwg0.930.870.78(r) The data item has been revised since previously published in StatsWales.0.97(r) The data item has been revised since previously published in StatsWales.0.97(r) The data item has been revised since previously published in StatsWales.0.95(r) The data item has been revised since previously published in StatsWales.0.97(r) The data item has been revised since previously published in StatsWales.0.93(r) The data item has been revised since previously published in StatsWales.0.90(r) The data item has been revised since previously published in StatsWales.0.86(r) The data item has been revised since previously published in StatsWales.0.86(r) The data item has been revised since previously published in StatsWales.0.86(r) The data item has been revised since previously published in StatsWales.0.850.870.890.90
Caerdydd2.352.181.96(r) The data item has been revised since previously published in StatsWales.2.42(r) The data item has been revised since previously published in StatsWales.2.37(r) The data item has been revised since previously published in StatsWales.2.30(r) The data item has been revised since previously published in StatsWales.2.31(r) The data item has been revised since previously published in StatsWales.2.24(r) The data item has been revised since previously published in StatsWales.2.17(r) The data item has been revised since previously published in StatsWales.2.06(r) The data item has been revised since previously published in StatsWales.2.15(r) The data item has been revised since previously published in StatsWales.2.13(r) The data item has been revised since previously published in StatsWales.2.072.112.172.26
Rhondda Cynon Taf1.391.281.15(r) The data item has been revised since previously published in StatsWales.1.47(r) The data item has been revised since previously published in StatsWales.1.46(r) The data item has been revised since previously published in StatsWales.1.41(r) The data item has been revised since previously published in StatsWales.1.45(r) The data item has been revised since previously published in StatsWales.1.42(r) The data item has been revised since previously published in StatsWales.1.39(r) The data item has been revised since previously published in StatsWales.1.34(r) The data item has been revised since previously published in StatsWales.1.33(r) The data item has been revised since previously published in StatsWales.1.29(r) The data item has been revised since previously published in StatsWales.1.261.271.301.30
Merthyr Tudful0.170.160.14(r) The data item has been revised since previously published in StatsWales.0.18(r) The data item has been revised since previously published in StatsWales.0.17(r) The data item has been revised since previously published in StatsWales.0.17(r) The data item has been revised since previously published in StatsWales.0.17(r) The data item has been revised since previously published in StatsWales.0.17(r) The data item has been revised since previously published in StatsWales.0.16(r) The data item has been revised since previously published in StatsWales.0.16(r) The data item has been revised since previously published in StatsWales.0.15(r) The data item has been revised since previously published in StatsWales.0.15(r) The data item has been revised since previously published in StatsWales.0.150.150.150.15
Caerffili1.121.040.94(r) The data item has been revised since previously published in StatsWales.1.18(r) The data item has been revised since previously published in StatsWales.1.17(r) The data item has been revised since previously published in StatsWales.1.16(r) The data item has been revised since previously published in StatsWales.1.17(r) The data item has been revised since previously published in StatsWales.1.15(r) The data item has been revised since previously published in StatsWales.1.12(r) The data item has been revised since previously published in StatsWales.1.07(r) The data item has been revised since previously published in StatsWales.1.06(r) The data item has been revised since previously published in StatsWales.1.05(r) The data item has been revised since previously published in StatsWales.1.041.051.071.07
Blaenau Gwent0.330.300.27(r) The data item has been revised since previously published in StatsWales.0.35(r) The data item has been revised since previously published in StatsWales.0.34(r) The data item has been revised since previously published in StatsWales.0.40(r) The data item has been revised since previously published in StatsWales.0.38(r) The data item has been revised since previously published in StatsWales.0.35(r) The data item has been revised since previously published in StatsWales.0.32(r) The data item has been revised since previously published in StatsWales.0.31(r) The data item has been revised since previously published in StatsWales.0.31(r) The data item has been revised since previously published in StatsWales.0.30(r) The data item has been revised since previously published in StatsWales.0.290.300.300.30
Tor-faen0.530.490.44(r) The data item has been revised since previously published in StatsWales.0.53(r) The data item has been revised since previously published in StatsWales.0.53(r) The data item has been revised since previously published in StatsWales.0.50(r) The data item has been revised since previously published in StatsWales.0.50(r) The data item has been revised since previously published in StatsWales.0.48(r) The data item has been revised since previously published in StatsWales.0.47(r) The data item has been revised since previously published in StatsWales.0.44(r) The data item has been revised since previously published in StatsWales.0.44(r) The data item has been revised since previously published in StatsWales.0.43(r) The data item has been revised since previously published in StatsWales.0.430.430.440.44
Sir Fynwy0.520.490.44(r) The data item has been revised since previously published in StatsWales.0.55(r) The data item has been revised since previously published in StatsWales.0.56(r) The data item has been revised since previously published in StatsWales.0.52(r) The data item has been revised since previously published in StatsWales.0.52(r) The data item has been revised since previously published in StatsWales.0.49(r) The data item has been revised since previously published in StatsWales.0.48(r) The data item has been revised since previously published in StatsWales.0.45(r) The data item has been revised since previously published in StatsWales.0.46(r) The data item has been revised since previously published in StatsWales.0.46(r) The data item has been revised since previously published in StatsWales.0.470.470.480.48
Casnewydd0.950.880.79(r) The data item has been revised since previously published in StatsWales.0.98(r) The data item has been revised since previously published in StatsWales.0.98(r) The data item has been revised since previously published in StatsWales.0.95(r) The data item has been revised since previously published in StatsWales.0.95(r) The data item has been revised since previously published in StatsWales.0.92(r) The data item has been revised since previously published in StatsWales.0.90(r) The data item has been revised since previously published in StatsWales.0.80(r) The data item has been revised since previously published in StatsWales.0.80(r) The data item has been revised since previously published in StatsWales.0.80(r) The data item has been revised since previously published in StatsWales.0.790.790.800.82
[Lleihau]De-orllewin CymruSir Benfro0.720.680.62(r) The data item has been revised since previously published in StatsWales.0.78(r) The data item has been revised since previously published in StatsWales.0.76(r) The data item has been revised since previously published in StatsWales.0.76(r) The data item has been revised since previously published in StatsWales.0.77(r) The data item has been revised since previously published in StatsWales.0.72(r) The data item has been revised since previously published in StatsWales.0.71(r) The data item has been revised since previously published in StatsWales.0.67(r) The data item has been revised since previously published in StatsWales.0.67(r) The data item has been revised since previously published in StatsWales.0.67(r) The data item has been revised since previously published in StatsWales.0.680.690.700.69
Sir Gaerfyrddin1.121.060.97(r) The data item has been revised since previously published in StatsWales.1.22(r) The data item has been revised since previously published in StatsWales.1.21(r) The data item has been revised since previously published in StatsWales.1.21(r) The data item has been revised since previously published in StatsWales.1.21(r) The data item has been revised since previously published in StatsWales.1.15(r) The data item has been revised since previously published in StatsWales.1.13(r) The data item has been revised since previously published in StatsWales.1.08(r) The data item has been revised since previously published in StatsWales.1.07(r) The data item has been revised since previously published in StatsWales.1.07(r) The data item has been revised since previously published in StatsWales.1.081.091.131.17
Abertawe1.401.301.16(r) The data item has been revised since previously published in StatsWales.1.45(r) The data item has been revised since previously published in StatsWales.1.43(r) The data item has been revised since previously published in StatsWales.1.41(r) The data item has been revised since previously published in StatsWales.1.42(r) The data item has been revised since previously published in StatsWales.1.38(r) The data item has been revised since previously published in StatsWales.1.35(r) The data item has been revised since previously published in StatsWales.1.31(r) The data item has been revised since previously published in StatsWales.1.30(r) The data item has been revised since previously published in StatsWales.1.29(r) The data item has been revised since previously published in StatsWales.1.271.291.321.33
Castell-nedd Port Talbot0.630.580.53(r) The data item has been revised since previously published in StatsWales.0.67(r) The data item has been revised since previously published in StatsWales.0.67(r) The data item has been revised since previously published in StatsWales.0.65(r) The data item has been revised since previously published in StatsWales.0.65(r) The data item has been revised since previously published in StatsWales.0.64(r) The data item has been revised since previously published in StatsWales.0.60(r) The data item has been revised since previously published in StatsWales.0.57(r) The data item has been revised since previously published in StatsWales.0.58(r) The data item has been revised since previously published in StatsWales.0.58(r) The data item has been revised since previously published in StatsWales.0.580.590.590.60

Metadata

Teitl

Traffig ffyrdd yn ôl Awdurdodau Lleol a blwyddyn heb gynnwys cefnffyrdd (biliwn o gilomedrau cerbydau)


Diweddariad diwethaf

Hydref 2023 Hydref 2023

Diweddariad nesaf

Hydref 2024 (dros dro)

Sefydliad cyhoeddi

Llywodraeth Cymru

Ffynhonnell 1

Arolwg Traffig ar Sail Data â Gesglir â Llaw, yr Adran Drafnidiaeth

Cyswllt ebost

ystadegau.trafnidiaeth@llyw.cymru

Dynodiad

Ystadegau Gwladol

Lefel isaf o ddadelfennu daearyddol

Cymru

Cwmpas daearyddol

Awdurdodau lleol

Cwmpas ieithyddol

Saesneg a Chymraeg

Trwyddedu data

Gallwch ddefnyddio ac ailddefnyddio'r data hwn am ddim mewn unrhyw fformat neu gyfrwng, dan delerau'r Drwydded Llywodraeth Agored - gweler http://www.nationalarchives.gov.uk/doc/open-government-licence-cymraeg

Disgrifiad cyffredinol

Mae'r ystadegau'n cyfeirio at lefelau traffig ar y ffyrdd yng Nghymru. Mae amcangyfrifon traffig ar y ffyrdd ar gyfer Cymru yn cael eu paratoi gan yr Adran Drafnidiaeth ar ran Llywodraeth Cymru. Mae'r amcangyfrifon hyn yn seiliedig ar y cyfrifiadau traffig â llaw sy'n cael eu cynnal wrth ochr y ffordd ledled Cymru yn ystod y flwyddyn. Mae'r cyfrifiadau wrth ochr y ffordd hyn yn cael eu cyfuno â data cyfrifiadau traffig awtomatig a hydoedd ffyrdd i gynhyrchu amcangyfrifon traffig cyffredinol.

Mae'r amcangyfrifon traffig ar gyfer pob prif ffordd yn seiliedig ar gyfrifiad o bob ffordd o'r fath, ond mae amcangyfrifon ar gyfer is-ffyrdd yn cael eu cynhyrchu drwy gyfrifo cyfraddau tyfu o sampl penodol o fannau ar y rhwydwaith is-ffyrdd. Mae rhagor o fanylion ynglyn â'r fethodoleg ar gael gan yr Adran Drafnidiaeth yn o ddolen isod:
https://www.gov.uk/government/publications/road-traffic-speeds-and-congestion-statistics-guidance
.
Mae pob ffordd ag arwyneb yn cael ei chynnwys yn yr amcangyfrifon (heb gynnwys cefnffyrdd). Y categorïau yw:
Prif ffyrdd:
Traffyrdd. Ffyrdd deuol wedi'u cynllunio ar gyfer traffig cyflym, lle mae mynediad wedi'i gyfyngu i gerbydau modur, a nifer cymharol isel o fannau ar gyfer ymuno neu ymadael. Yr unig draffordd yng Nghymru yw'r M4.

Ffyrdd gwledig categori A. Pob ffordd categori A arall.

Mae amcangyfrifon ar gyfer ffyrdd A ar gael gydag is-gategorïau ar gyfer ffyrdd trefol a gwledig ar StatsCymru. Ffyrdd trefol yw'r ffyrdd hynny o fewn ffiniau ardaloedd â phoblogaeth o 10,000 neu'n uwch, a ffyrdd gwledig yw'r holl brif ffyrdd eraill nad ydynt yn draffyrdd.

Is-ffyrdd:
Ffyrdd B. Ffyrdd â'r nod o gysylltu ardaloedd gwahanol, a mynd â thraffig rhwng ffyrdd A a ffyrdd llai ar y rhwydwaith.

Ffyrdd dosbarthiadol heb rif. Ffyrdd llai â'r nod o gysylltu ffyrdd diddosbarth â ffyrdd A a B, sydd yn aml yn cysylltu ystad tai neu bentref â gweddill y rhwydwaith. Maent yn debyg i 'is-ffyrdd' ar fap Arolwg Ordnans, ac weithiau cyfeirir atynt yn answyddogol fel ffyrdd C.
Ffyrdd diddosbarth. Ffyrdd lleol ar gyfer traffig lleol. Mae mwyafrif helaeth ffyrdd yn y categori hwn.

Mae’r dadansoddiad yn ôl math o gerbyd yn seiliedig ar arsylwi ochr ffordd ble y caiff y cerbydau eu dosbarthu yn unol â’u
hymddangosiad cyffredinol. Y mathau o gerbydau a nodir yw: 1) Beiciau pedlau: I gynnwys pob beic heb fodur, 2) Beiciau modur: cerbydau dwy olwyn, gan gynnwys mopeds, cerbyd sgwter a chyfuniadau beiciau modur, 3) Ceir a thacsis: I gynnwys ceir estynedig, pob fan ysgafn sydd â ffenestr y tu ôl i sedd y gyrrwr, cerbydau i deithwyr gyda 9 sedd neu lai, cerbydau 3 olwyn, cerbydau modur i gleifion, Land Rovers, Range Rovers a Jeeps. Mae ceir sy’n tynnu carafanau neu drelars yn cael eu cyfrif fel un cerbyd, 4) Bysiau a coetsys: I gynnwys pob cerbyd gwasanaethau cyhoeddus a bysiau gwaith ar wahân i gerbydau sydd â llai na 10 o seddau, 5) Faniau ysgafn: Pob cerbyd nwyddau hyd at 3,500kg o bwysau gros. Mae hyn yn cynnwys pob fan ar ffurf car a’r rhai sydd â’r capasiti nesaf o ran cludo, megis faniau cludo. Mae ambiwlans, faniau cludo llai, cerbydau cludo llaeth a cherbydau a reolir gan gerddwr yn cael eu cynnwys hefyd. Mae rhan fwyaf y grwp hwn yn faniau cludo nwyddau o ryw fath, 6) Cerbydau nwyddau: Pob cerbyd nwyddau dros 3,500kg pwysau gros. I gynnwys tractorau (heb drelar), rholwyr ffordd, faniau bocs a faniau mawr tebyg. Mae uned tractor modur dwy echel heb drelar wedi eu cynnwys hefyd, 7) Pob cerbyd modur: Pob cerbyd ar wahân i feiciau pedalau.
Mae lefelau traffig yn cael eu mesur gan ddefnyddio cilomedrau cerbyd (VKM), sy'n cael eu cyfrifo drwy luosi cyfartaledd blynyddol y llif bob dydd â hyd y darn o ffordd o dan sylw. Er enghraifft, byddai un cerbyd yn teithio un cilomedr bob dydd am flwyddyn yn hafal i 365 VKM y flwyddyn. Yn y cyhoeddiad hwn cyflwynir amcangyfrifon mewn biliynau o gilometrau cerbyd (bvk).


Casgliad data a dull cyfrifo

Caiff amcangyfrifon traffig Cymru eu paratoi gan yr Adran Drafnidiaeth ar ran Llywodraeth Cymru. Mae’r amcangyfrifon hyn yn seiliedig ar y cyfrifon traffig ffordd blynyddol ar ochr y ffordd sy’n cael eu cynnal ledled Cymru yn ystod y flwyddyn. Caiff y cyfrifon hyn ar ochr y ffordd eu cyfuno gyda’r data cyfrif traffig awtomatig a hyd y ffyrdd i gynhyrchu’r amcangyfrifon traffig cyffredinol.

Mae’r Adran Drafnidiaeth hefyd yn creu gwefan ddaearyddol sy’n caniatâu i ddefnyddwyr weld a lawrlwytho yr amcangyfrifon o lif y traffig ar bob ffordd gyswllt o’r rhwydwaith ffyrdd ‘A’ a thraffyrdd ym Mhrydain Fawr yn ogystal â setiau data traffig ar gyfer 2000 i 2019 (priffyrdd ac is-ffyrdd):
http://www.dft.gov.uk/traffic-counts/

Amlder cyhoeddi

Blynyddol

Talgrynnu wedi'u ddefnyddio

Mae data wedi'u talgrynnu i ddau le degol. Ar gyfer cofnodion lle nad oes data defnyddir "*".

Allweddeiriau

Trafnidiaeth traffig ffyrdd awdurdod lleol heb gynnwys cefnffyrdd

Dolenni'r we

Lefelau traffig ar y ffyrdd, cyhoeddiad ystadegol: https://llyw.cymru/traffig-ffyrdd

Ansawdd ystadegol

Mae'r ystadegau hyn yn cael eu defnyddio o fewn Llywodraeth Cymru i lunio a monitro polisïau, ac maent hefyd yn cael eu defnyddio i roi gwybodaeth i adrannau llywodraethol eraill, busnesau, y cyfryngau a'r cyhoedd. Nid oes unrhyw ffynonellau data cynhwysfawr eraill i alluogi cynhyrchu ystadegau traffig ar gyfer Cymru a Phrydain Fawr. Dyma rai o'r ffyrdd penodol mae'r data'n cael eu defnyddio:
1. Mae dangosyddion Cynllun Trafnidiaeth Cenedlaethol Cymru yn cynnwys y data hyn ar lif traffig. Mae'r dangosyddion hyn yn mesur y newid i lifoedd traffig ar gyfer Cymru yn ei chyfanrwydd ac ar gyfer ardaloedd awdurdodau lleol unigol.
2. Bydd y data hyn hefyd yn cael eu defnyddio'n rhan o'r cyfrifiadau i ateb unrhyw geisiadau am wybodaeth am y gyfradd anafusion ar gyfer lefelau traffig ar rannau gwahanol o ffyrdd.
3. Mae gwybodaeth am allyriadau CO2 cenedlaethol a lleol sy'n gysylltiedig â thraffig yn defnyddio'r amcangyfrifon hyn o lifoedd traffig.

Cywirdeb
Mae’r amcangyfrifon o draffig ar y ffyrdd yn seiliedig ar ganlyniadau llawer o gyfrifiadau â llaw 12 awr sy'n cael eu cynnal bob blwyddyn, sy'n cael eu grosio i amcangyfrifon o gyfartaledd blynyddol llifoedd bob dydd gan ddefnyddio ffactorau ehangu sy'n seiliedig ar ddata o gyfrifiadau traffig awtomatig ar ffyrdd tebyg. Mae angen y cyfartaleddau hyn er mwyn ystyried traffig ar adegau tawel, ar y penwythnos ac yn yr haf a'r gaeaf (pan fydd cyfrifiadau arbennig yn unig yn cael eu cynnal) wrth asesu'r traffig ar bob safle. Mae'r Adran Drafnidiaeth bellach yn rhannu'r mathau o ffyrdd yn 22 grwp (dim ond saith a fu yn flaenorol). Mae hyn yn gwneud cymharu lleoliadau cyfrifiadau â llaw a lleoliadau cyfrifiadau awtomatig yn haws. Roedd y grwpiau hyn yn seiliedig ar ddadansoddiadau manwl o ganlyniadau o holl safleoedd y cyfrifiadau awtomatig unigol, ac maent yn ystyried grwpiau rhanbarthol, categorïau ffyrdd (h.y. dosbarthiad trefol/gwledig a chategori'r ffordd), a lefelau llif y traffig.