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Road traffic statistics

28439

Details

AADF latest year 2020
Region East of England
Local authority Hertfordshire
Road name A4147
Road type Major
Start junction road A4146
End junction road Aycliffe Drive, Hemel Hempstead
Link length 1.60km (0.99 miles)
Easting & Northing 506000,208800
Latitude & longitude 51.76786,-0.46526

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
2020 Manual count 15,552 12,823 2,421 199 56 99 9
2019 Estimated using AADF from previous year on this link 21,814 18,030 3,048 560 99 133 42
2018 Estimated using AADF from previous year on this link 21,770 17,991 3,058 555 82 124 43
2017 Estimated using AADF from previous year on this link 21,710 18,077 2,920 541 84 127 45
2016 Manual count 21,562 18,099 2,759 526 84 131 47
2015 Estimated using AADF from previous year on this link 23,676 20,049 2,703 559 41 246 119
2014 Estimated using AADF from previous year on this link 22,780 19,462 2,431 527 41 238 121
2013 Estimated using AADF from previous year on this link 22,160 19,023 2,265 532 52 231 108
2012 Estimated using AADF from previous year on this link 22,223 19,253 2,134 512 52 219 105
2011 Manual count 22,275 19,393 2,049 505 56 225 103
2010 Manual count 18,965 16,255 2,038 426 71 178 68
2009 Manual count 20,310 17,616 2,105 341 65 168 80
2008 Estimated using AADF from previous year on this link 21,260 18,044 2,343 566 18 236 71
2007 Estimated using AADF from previous year on this link 21,392 18,171 2,338 570 18 243 70
2006 Estimated using AADF from previous year on this link 21,279 18,299 2,110 554 18 242 74
2005 Estimated using AADF from previous year on this link 20,847 17,993 2,014 540 19 223 77
2004 Estimated using AADF from previous year on this link 20,897 18,120 1,925 539 18 233 80
2003 Manual count 20,374 17,817 1,730 501 18 229 97
2002 Estimated using AADF from previous year on this link 20,519 17,815 2,010 340 51 245 109
2001 Estimated using AADF from previous year on this link 19,981 17,313 1,994 329 48 240 105
2000 Manual count 19,331 16,792 1,888 331 55 218 102

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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 28439 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 28439 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. 21
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. 42
Raw counts Vehicle counts recorded at this count point. 168

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