Trip generation



One of the best ways to assess current and future trip generation is to survey current movements at the same site or somewhere similar. You can use information on how people travel now to predict how people will travel in future.

If possible, you should also survey all the current delivery and servicing movements to and from the site.

See survey instructions and use our data collection template:


You can use the TRICS database which includes the results of travel surveys from many developments across London and the UK. The sites used should be similar to the proposed development in terms of location, scale, land use and car parking.

Mode share

Once you've estimated the total number of new trips at your new development, split them by transport mode using similar site surveys or the most recent UK census. This helps us understand how London's walking, cycling, public transport and highway networks may be affected.

As the latest census data is now quite old, adjustments might need to be made to reflect current travel patterns (e.g. increased cycle trips). Please explain and justify any adjustments you make clearly in your Transport Assessment (TA).

Cumulative impacts

You can combine trip generation for a new development with trips generated by nearby developments for your Transport Assessment (TA). This helps us assess cumulative impacts on the London-wide network.

Growth assumptions and infrastructure investment

Your TA should assess how travel and transport will be at your new development when it's occupied (not now). So, you may need to use growth assumptions about how travel and freight in London, or the local area of your planning application, will change in future.

Infrastructure investment will also play a role in how trips generated by a new development impact London's walking, cycling, public transport and highway networks. So, you need to include information on future infrastructure investment in your planning application.

Trips generated by construction

You can use our tool to estimate trips generated by construction:

Use a different method

If you want to use another method for trip generation, or other data sources and decisions for mode share, your assessment approach should be approved by us through our pre-application services. You must explain and justify it in your Transport Assessment.