Road work at the Interstate 70 Eisenhower-Johnson Memorial Tunnels will require alternating traffic through the tunnels overnight for the next month.

The resurfacing project that is underway is expected to result in up to 30 minutes of delay and will continue through late October, according to a news release from the Colorado Department of Transportation.

The project will remove the existing pavement on the right lanes of I-70 in both tunnels and replace it with new asphalt, fixing rutting and providing a safer driving experience before winter hits, the release states.

Travel impacts will be limited to Sunday nights through Thursday nights, with the tunnels open in both directions on Fridays and Saturdays, according to the transportation department. Traffic in both directions will be held at the entrance of the tunnel while one direction is escorted through the tunnel safely at a time, the release states.

Through the end of September, overnight one-way closures of the tunnels will result in alternating traffic from 9 p.m. to 6 a.m. on Sundays and 8 p.m. to 5 a.m. Mondays through Thursdays, the release states. From October 1 until the project is complete, the alternating traffic is planned from 8 p.m. to 5 a.m. Sundays through Thursdays.

Drivers should obey the posted speed limit, leave plenty of space when following other vehicles, pay attention and watch for crews and equipment during the overnight work, according to transportation officials.

The latest information on I-70 lane closures and road conditions is available at COTrip.org.