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Hertfordshire County Council

Transport and accident data

Traffic data

Traffic and transport data reports (TTDR)

Traffic and transport data reports are produced annually, summarising the latest available information on:

  • traffic levels and growth
  • congestion and air quality
  • how people choose to travel
  • sustainable transport and future improvements.

For a shortened version of the full report, read the 2017 transport factsheet (based on 2016 data).

Previous traffic and transport data reports


Traffic data requests

The road traffic database contains traffic data for roads in Hertfordshire. It has been created using both electronic and manual traffic counts.

Take a look at a map of traffic count data.

For all enquiries, contact David Hart:


Phone: 01992 658323

Charges may apply for this information depending on individual requirements. Read the data charging policy.

Accident data

Casualty factsheets

Casualty factsheets are produced annually, summarising the most up to date information about traffic accidents and casualties in Hertfordshire.


Previous casualty factsheets


Accident data requests

The road collision database uses accident data (STATS19) supplied by the police. In some cases, there may be restrictions on the accident data that can be supplied.

For all enquiries, please contact Anthea Nott:


Phone: 01992 658338

Or Antony Oldridge:


Phone: 01992 658339

Charges may apply for this information depending on individual requirements. Read the data charging policy.

Mobility surveys and transport modelling

Town Evidence Packs

Town Evidence Packs can help you to understand local movements and interactions around a specific town. They can help developers with pre-application work.

Packs include:

  • origin and destination movements
  • trip patterns by mode of transport
  • journey times
  • congestion and accident data
  • demographic analysis
  • economic data.

Town Evidence Pack summaries


Each pack costs £750.

Contact us to buy a pack or get more information.

Phone: 01992 588614


Countywide multi-modal transport model travel patterns

In early 2015, AECOM developed a countywide multi-modal transport model (COMET).

They produced a Pattern of travel across Hertfordshire report which has helped us to understand how people travel in Hertfordshire. This has improved our understanding of how to develop the county's transport infrastructure and accessibility.

Hertfordshire county travel survey

The Hertfordshire county travel survey recorded how a large number of our residents travel.


District specific results


The results of these surveys have helped us to improve our existing transport structures and have assisted with developing new schemes.

For further analysis or comment...

Contact Gary Beaumont:


Phone: 01992 588614