Policy for the introduction of 20mph speed limits and zones
This page outlines the current proposals for the policy for the introduction of 20mph limits and zones in the Borough. Please also read the Process for handling public requests, the policy in full and the Appendices, so that you can provide feedback to inform the final policy.
Policy
We intend to introduce a policy for the introduction of 20mph limits and zones in the Borough.
There are various advantages associated with 20mph speed limits.
- Controlling vehicle speeds to 20mph or less is an important tool for improving road safety, particularly for vulnerable road users. There is clear evidence of the effect of reducing traffic speeds on the reduction of collisions and casualties, as collision frequency is less at lower speeds, and where collisions do occur, there is a reduced risk of fatal and serious injury.
- The Department for Transport (DfT) guidance relating to cycling infrastructure. recommends managing vehicle speeds (not just the speed limit) to 20mph or less where cyclists are required to use the carriageway. The considered use of 20mph limits forms a key part of Rotherham Cycling Strategy.
- Where speeds of 20mph are achieved, noise from road traffic may be reduced by as much as 5 decibels.
- Where 20mph zones are introduced, drivers may feel encouraged to use more suitable routes where these permit higher speeds, reducing traffic within the zones
Key aspects of the policy
- A 1 mph reduction in average speed can reduce the collision frequency in urban areas by around 2 - 6%
- Reduction in accidents in 20mph speed limits supported with physical traffic calming to be around 40% - 60%
- At 20mph noise from road traffic may be reduced by as much as 5 decibels.
Criteria for streets eligible for 20mph speed limits
| After speeds |
Top speed of 85% of motorised traffic should be less than 20mph, must be less than 22mph >20mph only acceptable where
|
Ensure likelihood of death or serious injury in event of collision is truly minimised |
| After volumes |
PCU = Passenger Car Unit Should not exceed in any hour
|
Surrounding network of roads should be attractive alternative to encourage traffic out of minor streets |
| Bus usage |
Preferably no buses Maximum 6 buses per hour each way, except in a town centre location |
To minimise situations inviting speeds exceeding 20mph |
Online survey
This consultation closed on the 1 January 2024.
