We prepare trip generation estimates to provide an early indication of the traffic likely to be generated by a development. Using recognised datasets such as TRICS trip rates, first principles calculations and professional judgement, we calculate the expected vehicle trips, traffic distribution and multi-modal trip generation associated with the proposed land use.
Our trip generation estimates help shape design decisions, identify potential constraints, and determine whether further transport assessment is required. These estimates are an essential tool for developers, planners, and transport consultants to assess feasibility at an early stage and support planning discussions.
What are trip generation estimates?
Trip generation estimates are calculated projections of the number of trips likely to be generated by a development, based on its size, type, location and intended use. We use recognised trip generation data from sources such as the TRICS database to provide reliable, evidence-led estimates of how many vehicles are expected to arrive at or depart from the site during peak periods.
These estimates are a key part of the early feasibility phase, helping you understand the likely scale of transport impact and the type of transport assessment that may be required for your planning submission.
Our trip generation estimates are tailored to each development and typically include:
-
Trip generation rates from industry-standard sources (e.g. TRICS)
-
Estimates of daily and peak hour trip rates
-
Traffic distribution assumptions (where relevant)
-
Comparison to existing traffic levels or nearby developments
-
Projections based on specific land uses or site characteristics
-
Consideration of access, parking and sustainable travel options and their influence on trip making
-
Vision-led trip generation scenarios applying the 'Decide and Provide' apporach
The value of early trip generation estimates lies in setting realistic expectations about scale and impact before design decisions are fixed. By establishing credible trip ranges at an early stage, we help clients understand whether transport is likely to be a defining constraint, a manageable consideration, or unlikely to influence deliverability at all.
This clarity informs access design, assessment scope and planning strategy, reducing the risk of over assessment on one hand or late stage challenge on the other. It also provides a sound basis for early discussion with highway authorities, grounded in recognised data and professional judgement rather than assumption.
Why trip generation estimates matter
Trip generation estimates are vital for understanding the transport impact of a proposed development. Early, accurate estimates allow clients to identify potential traffic concerns, adjust proposals if necessary, and ensure the appropriate level of assessment is undertaken.
The value lies in identifying potential traffic impacts early on, helping mitigate any concerns about network capacity, congestion or safety. It also guides the planning process by providing clear, evidence-based estimates that support engagement with highway authorities and inform planning discussions.
Our approach
We take a clear, methodical approach to trip generation estimates:
-
Understand the development proposal and site context
-
Select appropriate data sources and trip generation rates
-
Calculate trip generation estimates for different peak periods and different scenarios
-
Consider the wider transport context, including access and infrastructure
-
Present findings clearly, with appropriate commentary and illustrations
Our focus is on providing reliable, proportionate estimates that align with industry standards and local expectations.
Who we support
We prepare trip generation estimates for a wide range of developments, including:
-
Residential developments
-
Retail and commercial sites
-
Employment and industrial schemes
-
Education and healthcare facilities
-
Mixed-use and strategic land developments
Our experience across England, Scotland, and Wales gives us a strong understanding of local authority expectations and transport impact considerations.
Need reliable trip generation estimates for your development?
Get in touch and we will provide accurate, evidence-led estimates to inform your planning application.
Contact Us
