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1 August 2017, 07:35
Work has finished on the M3 and the 50mph speed limit has been lifted.
The 13-mile stretch between Farnborough and the M25 is now a smart motorway.
It means there will be variable speed limits, and vehicles will be able to use the hard shoulder at busy times.
It's designed to make the traffic flow more smoothly, make journey times more reliable, and reduce crashes.
The use of active traffic management was first used in the UK on the M42 in the West Midlands back in 2006.
Here are some tips for using a smart motorway: