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Road traffic statistics

36121

Details

AADF latest year 2024
Region London
Local authority Hillingdon
Road name A4
Road type Major
Start junction road A437
End junction road LA Boundary
Link length 1.20km (0.75 miles)
Easting & Northing 510000,177000
Latitude & longitude 51.48127,-0.4173

Location

Contents

Average Annual Daily Flow

Average annual daily flow
Year Count method All motor vehicles Cars & taxis LGVs HGVs Pedal cycles Motorcycles Buses & coaches
2024 Estimated using AADF from previous year on this link 20,956 17,143 1,867 446 225 410 1,091
2023 Estimated using AADF from previous year on this link 21,022 17,244 1,856 450 202 392 1,080
2022 Manual count 21,018 17,280 1,824 457 197 386 1,072
2021 Estimated using AADF from previous year on this link 17,047 13,654 1,858 395 212 269 871
2020 Estimated using AADF from previous year on this link 15,868 12,656 1,743 370 237 236 864
2019 Estimated using AADF from previous year on this link 20,469 16,696 1,999 428 192 309 1,036
2018 Estimated using AADF from previous year on this link 20,416 16,652 2,000 428 204 293 1,043
2017 Estimated using AADF from previous year on this link 20,449 16,667 1,960 447 207 291 1,084
2016 Manual count 20,522 16,672 1,977 464 212 281 1,129
2015 Estimated using AADF from previous year on this link 20,636 16,975 1,346 954 148 277 1,084
2014 Estimated using AADF from previous year on this link 20,705 17,032 1,293 957 129 293 1,130
2013 Estimated using AADF from previous year on this link 20,698 16,983 1,251 1,003 115 282 1,178
2012 Estimated using AADF from previous year on this link 20,573 16,837 1,221 949 140 289 1,277
2011 Manual count 20,843 17,164 1,250 867 162 266 1,296
2010 Estimated using AADF from previous year on this link 21,416 17,407 1,721 588 143 252 1,448
2009 Estimated using AADF from previous year on this link 21,851 17,890 1,741 589 147 269 1,362
2008 Estimated using AADF from previous year on this link 22,033 18,035 1,788 635 135 284 1,291
2007 Manual count 22,498 18,459 1,826 652 116 292 1,269
2006 Estimated using AADF from previous year on this link 23,586 19,632 1,753 593 131 365 1,243
2005 Estimated using AADF from previous year on this link 23,165 19,278 1,768 599 105 335 1,185
2004 Estimated using AADF from previous year on this link 23,323 19,492 1,731 625 103 365 1,110
2003 Manual count 23,008 19,261 1,828 566 120 382 971
2002 Estimated using AADF from previous year on this link 26,722 23,110 1,634 800 52 304 874
2001 Estimated using AADF from previous year on this link 26,685 23,110 1,602 854 50 318 801
2000 Manual count 26,624 23,087 1,598 897 45 294 748

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Data disclaimer

Traffic figures at the regional and national level are robust, and are reported as accredited official statistics. However, DfT’s traffic estimates for individual road links and small areas are less robust, as they are not always based on up-to-date counts made at these locations. Where other more up-to-date sources of traffic data are available (e.g. from local highways authorities), this may provide a more accurate estimate of traffic at these locations.

It is the responsibility of the user to decide which data are most appropriate for their purpose, and if DfT road link level traffic estimates are used, to make a note of the limitations in any published material.

Quality flags in data downloads

DfT’s road link level traffic estimates are calculated using a variety of methods, with some methods likely to produce more accurate estimates than others.

The data tables available to download here contain a column - estimation_method – showing the method used to estimate traffic for each location and year. Figures having an estimation method of “Counted” are likely to be more accurate than those marked as “Estimated”, and the latter should be used with caution.

Site details
Manual count point site 36121 details
Average annual daily flow
Number of vehicles that travel past the count point (in both directions) on an average day of the year.
Average annual daily flow by direction
Number of vehicles that travel past the count point on an average day of the year, by direction of travel.
Raw counts
Vehicle counts recorded at this count point.
Data Description Records Download
Site details Manual count point site 36121 details 1
Average annual daily flow Number of vehicles that travel past the count point (in both directions) on an average day of the year. 25
Average annual daily flow by direction Number of vehicles that travel past the count point on an average day of the year, by direction of travel. 50
Raw counts Vehicle counts recorded at this count point. 144

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