Birmingham City Council believes that it can increase the city's low car occupancy of 1.2 per car to the 1.5 on routes with car share lanes in Leeds and Madrid. This would reduce the 3,000 cars in the morning peak by 750.
It chose a 5km stretch of the A47 eastern radial route to pilot the measure because there are no ready public transport alternatives and it has frequent lay-bys to help with enforcement.
Birmingham head of transportation strategy Chris Haynes said the £260,000 cost covers signs, lines and police enforcement. After a 12-month trial, the cabinet will decide whether to make the lane permanent.