A bill that would require truck drivers to stay to the right when driving on Interstate 81 in Virginia is headed to Gov. Mark Warner's desk.

The measure would prohibit trucks from driving in the left-most lane on I-81 in places where there are more than two lanes in one direction. It also would require trucks traveling at least 15 mph slower than the posted speed limit to keep to the far right of the interstate on stretches of two-lane road.

The bill – HB1346 – sponsored by Delegate Chris Saxman, R-Staunton, previously passed the House 99-0 and the Senate 40-0.

Another bill that could impact I-81 also has been sent to the governor.

HB1376, sponsored by Delegate William Fralin, R-Roanoke, would allow the state to vary toll rates to reward drivers who travel in “off-peak hours” such as overnight. Fralin told The Roanoke Times the bill would give the Virginia Department of Transportation the flexibility to adjust toll rates on roads built under the Public-Private Transportation Act.

Virginia transportation officials gave preliminary approval last month to a plan that would widen I-81 to eight lanes, with separate lanes for cars and trucks. Under the plan – submitted by a consortium of private builders known as Star Solutions – the expansion would be paid for, in part, with toll money collected from both cars and trucks.