Travel plans aim to reduce car use by promoting public transport, walking, cycling or reducing the need to travel altogether by using technology.
The quango has published guidance on London travel plans after finding that the standard of those submitted with planning applications varies considerably. Poorly conceived documents can delay decisions, it warned.
TfL workplace travel planning manager Conrad Haigh said: "Use of this guidance should lead to better travel plans. There is no reason why they should hold up the planning process."
The guidance admits that travel plans are sometimes seen by applicants and developers as an additional cost and a barrier to planning permission.
But they can save developers money by removing the need for highway infrastructure improvements or reducing land taken by car parking areas, TfL pointed out. Travel plans can also help to improve access and reduce congestion around developments, it added.
TfL plans to upload data for all travel plans in the capital onto an electronic monitoring system.
This will assess their success and provide data to inform future planning decisions, said Haigh.
Best Practice for Workplace Travel Planning for New Development is available from TfL (e-mail) firstname.lastname@example.org.