Multimillion-pound plans to upgrade an 11-mile section of the M23 in Surrey and West Sussex with an extra lane in each direction have been unveiled.
The smart motorway scheme will see the hard shoulder permanently changed to a live running lane between junction 8 for Reigate and 10 at Crawley.
Work on the scheme is due to start in March, and take two years to complete.
New signs and signals will be used to vary the speed limit to reduce congestion at busy times, and to control traffic if there is an obstruction on the road ahead.
There will also be emergency refuge areas for motorists who need to stop.
Plans will be on show at Nutfield Lodge in Nutfield Road, Redhill between 3pm and 6pm this Friday (6 October) and from 10am to 4pm on Saturday (7 October).