Technology testing is starting on a new stretch of M1 smart motorway between junction 28 at Mansfield and junction 31 at Worksop.
The 32km section will incorporate the conversion of the hard shoulder to an extra lane, variable speed limits, overhead electronic signs and emergency refuge areas.
Highways England senior project lead Andy Kirk said: “We are opening this road to traffic with four lanes available while we test the technology at a reduced speed limit.
“The tests will allow us to gather reliable traffic data and calibrate the technology systems along this stretch.
“We hope drivers will notice a positive difference during the testing period as the extra lane will increase capacity, but the really big improvement will come once the smart motorway is fully open next month.”
It comes as police tell MPs that live lane traffic incidents have increased on sections of the M25 where the hard shoulder has been used for running traffic.