Drivers on stretches of the M1, the M6, the M5 and the M602 have been limited to a top speed of 60mph in a bid to ascertain if driving more slowly helps reduce emissions.
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The national speed limit is 70 mph (112 km/h) on motorways, 70 mph (112 km/h) on dual carriageways, 60 mph (96 km/h) on single carriageways and generally 30 mph (48 km/h) (20 mph (32 km/h) in Wales) in areas with street lighting (Built-up area).
The cameras, called the Hadecs3, will help enforce variable speed limits on motorways. But when the speed limit is at its normal 70mph they will not be switched off and can catch people going over the national speed limit.
Best time to avoid motorway tailbacksMotorway traffic is considered to be lighter on certain days of the week, namely Tuesday, Wednesday and Thursday, particularly from 8pm to 6am. On the other hand, Fridays are more congested than any other weekday. They're also more dangerous, with nearly 20 per cent more accidents.
Real-Time Data: Waze Gets You There FasterThis lets Waze almost instantly create new routes to take you around slowdowns. This tends to mean arriving a few minutes sooner than with Google Maps, but it also involves many more turns and side streets. Google Maps, on the other hand, is a bit more direct.