Controlled motorways offer improved travel time reliability and less stress for drivers, but in some cases costs can outweigh benefits. FindingsThe costs of Controlled Motorways outweigh the benefits for the M25 Junction 15 to 16 section. This is because traffic volumes are high enough to activate the system to slow traffic, but they… Content type Benefit Date Posted 02/09/2016 Taxonomy (ARC-IT) Speed Warning and Enforcement (TM17), Variable Speed Limits (TM20), Traffic Signal Control (TM03), Integrated Decision Support and Demand Management (TM09), Regional Traffic Management (TM07) Geolocation links London, United Kingdom