The speed limit is 20mph on all roads in Merton except for Croydon Road, Bushey Road and TfL Red Routes where the limit is 30mph.
Map of speed limits January 2024
Map of speed limits, 20mph zones and dates implemented - January 2021
20mph zones
A legal and self-enforceable 20mph zone requires traffic calming features such as:
- road humps
- speed cushions
- road closures
- one-way systems
- pedestrian refuge islands and road narrowing to be introduced at the appropriate distance
November 2022
We have decided to change the speed limit to 30mph along Bushey Road between Grand Drive and Martin Way. The date for this change will be posted shortly.
Change of speed limit to 30mph on Bushey Road (Grand Drive to Martin Way)
July 2020
We completed our roll-out of borough-wide 20mph in 2020.
20mph zones prior to 2019
20mph speed limits
A 20mph limit does not require any traffic calming features as part of the legal requirements. It requires only the introduction of the appropriate signs and road markings at all the entry points into the area.
20mph speed limits prior to 2019
- Trinity Road area
- Merton Park area
- Melrose Avenue area
- Ashbourne Road area
- Merton Hall Road area
- Wandle Road area
- Farm Road area
- Green Lane area
- Ernle Road area
- Cecil Road area
- Claremont Avenue area
- West Barnes Lane area
Monitoring Analysis 2012
Merton has a combination of roads with 20 mph limits and 20 mph zones, mainly implemented during the past 4 years. The council commissioned an analysis of the effectiveness of the current schemes focusing on accident data at each of the individual limits and zones before and after installation, along with before and after traffic flow and vehicle speed data.
Interim Monitoring Analysis - TMS Report - July 2012