West Yorkshire Police say their vehicles can be in place at any time of day, 7 days a week, and are "highly visible and do not operate covertly".
These locations are accurate at the time of publication, but are subject to alteration without further notice.
**Photos are for illustrative purposes and do not represent exact locations.**
1. 30mph Horbury
A642 Northfield Lane, Horbury - between Cluntergate and M1 bridge.
2. 30mph Featherstone
A645 Wakefield Road, Featherstone - between Station Lane and 140m West of Lister Road (40mph Signs)
3. 30mph Asdale Road
A6186 Asdale Road, Wakefield - between Kingsley Avenue & Denby Dale Road.
4. 30mph Kinsley
B6273 Wakefield Road, Kinsley (Statics on Site) - between Holgate Terrace and Hoyle Mill Road.