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Road traffic statistics

27681

Details

AADF latest year 2024
Region London
Local authority Hillingdon
Road name A4020
Road type Major
Start junction road A312
End junction road A312
Link length 4.30km (2.67 miles)
Easting & Northing 510000,181400
Latitude & longitude 51.52082,-0.41593

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 28,508 23,683 2,710 517 350 790 807
2023 Manual count 28,593 23,823 2,694 521 313 756 800
2022 Estimated using AADF from previous year on this link 26,914 22,396 3,303 288 313 307 620
2021 Estimated using AADF from previous year on this link 25,998 21,804 3,043 272 306 266 613
2020 Estimated using AADF from previous year on this link 24,162 20,211 2,854 257 342 233 608
2019 Manual count 31,264 26,661 3,274 294 277 306 729
2018 Estimated using AADF from previous year on this link 29,303 24,690 3,105 391 344 313 803
2017 Estimated using AADF from previous year on this link 29,298 24,712 3,043 397 349 311 835
2016 Estimated using AADF from previous year on this link 29,362 24,719 3,069 405 357 300 870
2015 Manual count 29,720 25,240 2,975 403 345 279 823
2014 Estimated using AADF from previous year on this link 26,118 21,665 2,482 684 117 504 782
2013 Estimated using AADF from previous year on this link 26,036 21,603 2,401 730 104 486 816
2012 Estimated using AADF from previous year on this link 25,840 21,417 2,343 699 127 498 884
2011 Estimated using AADF from previous year on this link 26,233 21,833 2,399 646 147 458 897
2010 Manual count 26,271 21,899 2,411 632 148 460 869
2009 Estimated using AADF from previous year on this link 28,479 24,759 2,304 428 124 186 802
2008 Manual count 28,729 24,959 2,365 448 114 197 760
2007 Manual count 25,296 21,916 1,900 889 23 231 360
2006 Manual count 27,526 22,060 3,971 561 297 298 636
2005 Manual count 30,675 26,803 2,270 821 159 159 622
2004 Manual count 31,816 27,540 2,308 1,079 144 275 614
2003 Manual count 35,494 30,595 2,999 886 237 268 746
2002 Manual count 34,635 29,261 3,484 1,111 67 165 614
2001 Manual count 35,823 30,286 3,816 603 112 376 742
2000 Manual count 31,799 26,747 3,446 904 54 175 527

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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 27681 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 27681 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. 312

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