Freedom of Information Request

Speed Surveys

Received: 6 June 2022

If for any roads that have had their speed limits dropped from 40 to 30mph in the last 15 years and speed surveys were conducted before and after the change.

For each road what changes were recorded to the following
The average speed
The 85th percentile speed
The average speed of the fastest driver ie the faster 1 or 5%
The overall level of compliance with the speed limit.

Is the methodology designed to record free-flowing traffic speeds, so it can't be skewed traffic or by a group of cars following a single slow vehicle etc?

Outcome / Documents

  • Response (all information to be supplied) - application/pdf - Download