Minimum Speed 30 Preformed Thermoplastic Road MarkingThe Minimum Speed 30 preformed thermoplastic road marking is used to reduce the chances of stationary traffic by setting a minimum speed limit to improve traffic flow. Commonly used in tunnels, at airports, train stations, dual carriageways and built up areas where high levels of traffic is a common occurrence. This marking could also be used in combination with a No Waiting road marking to show there needs to be traffic flowing through designated