Measurements and calculations for reporting on amenities – design stage - KBCN1381
Reporting on accessible amenities is an explicit requirement of the Site-Specific Transport Assessment in Tra 01. However, if this assessment does not provide enough information to satisfy the relevant requirements for Tra 02, it must be supplemented by an additional report. This does not have to be provided by author of the transport assessment, and could, for example, be produced by the BREEAM assessor or a member of the design team.
02 Nov 2023 - Reference to calculating the AI removed. This, and reporting on accessible amenities are explicit requirements of the transport assessment in Tra 01. Title and wording updated to clarify the intent and made applicable to Tra 02.
Public Transport Access Index (PTAI) – Buildings in Greater London - KBCN1149
For projects in Greater London, the Public Transport Access Index (PTAI) should be derived directly from the TfL WebCAT platform. When this tool is used, the BREEAM Tra 01/02 PTAI/AI calculation is not required.
Requirements:
- Baseline: Assessors must use the PTAL version that is current at the time the Transport Assessment is undertaken (Concept Design).
- Post-Construction Consistency: Once the design-stage PTAI is established, it does not need to be updated at the Post-Construction stage, even if the local transport network or WebCAT data has changed in the interim.
- Location: Access data via TfL WebCAT.
- Procedure: Follow the below technical guide to extract the specific Accessibility Index (AI) value from the WebCAT CSV export (Cell G3) for entry into the BREEAM Platform.
Locating-PTAI-via-TfL-WebCAT
04 03 2026 - Updated to clarify requirements and adding instruction for locating PTAI or AI via TfL WebCAT
03 08 2022 - Updated to clarify that the version used must be current at the time of the transport assessment, but this does not need to be updated at post-construction stage
Safe pedestrian routes – Definition, measurement and verification - KBCN0238
Definition
Safe pedestrian routes include pavements and safe crossing points, which may be controlled or, for example, be identified by tactile paving, a crossing island or a dropped kerb. An element of judgement may be required, in which case justification should be provided.
Measurement
Distances could be measured, for example, along a pavement, across a road at a safe crossing point and along the pavement on the other side. The distance should not be measured diagonally across a road, following the most direct route.
Verification
The assessor’s site inspection is an important aspect of the assessment and may help to confirm that all relevant information is current and can include photographs of any key areas. This can also help to identify safe crossing points or hazards which may not be apparent from a desktop study. Alternatively, web-based map data may be used to satisfy the evidence requirements at both Design and Post-Construction Stage, provided that the assessor is satisfied that this clearly demonstrates compliance and that the evidence is robust and up to date.
Where web-based navigation maps (e.g. Google Maps/Street View) are used as evidence, this must include:
• Dated and marked-up site plan or a web-based navigation map viewer highlighting:
• Current location and type of transport nodes and local amenities.
• Current route and distance from the building via a safe pedestrian route.
• Plan or map scale.
When relying on web-based evidence for post-construction stage, the assessor must, additionally, provide verification that the information provided for the nodes/amenities is still accurate and up to date.
16 Sep 2025 - Wording relating to verification updated to clarify the intent.
29 Aug 2025 - Approach to web-based map data at post-construction stage updated and related wording amended accordingly
07 Mar 2024 - No changes have been made. This appears as 'updated' due to an administrative error.
11 Jan 2024 - Wording re-structured for clarity
19 Dec 2023 - Applicability to BIU V6 confirmed
Information correct as of 10