1of3 Expect traffic if you're heading through Boerne this weekend.Tom Reel /San Antonio Express-NewsShow MoreShow Less 2of3 3of3 If you're headed northwest from San Antonio this weekend, you may hit detour signs along the way. A large chunk of I-10 will be closed in Boerne by the Department of Transportation starting on Friday, April 30, at 9 p.m. Constructions crews will be demolishing the Business Highway 87/Main Street overpass, causing the interstate to be closed completely for 56 hours until 5 a.m. on Monday, May 3. According to a news alert from the City of Boerne, drivers headed westbound on I-10 (toward Kerrville) will have to exit at Main Street and stay on the access road and reenter before Highway 46. Drivers heading eastbound (toward San Antonio) will have to exit at a temporary exit ramp just past Highway 46 and will not be able to re-enter I-10 until they reach the on-ramp past Scenic Loop Road.