SUMMIT COUNTY, Colo. — Four people, including a mother and her two children, were taken to a hospital after a semitruck hauling construction materials on a flatbed trailer lost its brakes on Interstate 70 just west of the Eisenhower Tunnel and hit three vehicles on Friday morning.

The westbound lanes of I-70 reopened just before noon.

They were closed at U.S. 6 as a result of the crash, which happened shortly before 8 a.m. at mile marker 207. Witnesses indicated the truck had reached “extremely high speeds” just before the collision, according to Summit Fire and EMS.

Summit Fire and EMS said the vehicle with the mother and kids inside rolled several times. All three were taken to a hospital by ambulance.

The driver of the semitruck was initially unresponsive, according to Summit Fire, and was taken to St. Anthony Hospital in Lakewood by helicopter.

Two other vehicles were involved in the crash, but no one else was hurt, according to Summit Fire.

The westbound lanes were closed for several hours on the east side of the Eisenhower Tunnel while the Colorado State Patrol conducted an accident investigation and completed cleanup of hazardous materials, including fuel and oil, as well as the non-hazardous construction supplies that were scattered.