Westbound I-40 is CLOSED Due to Serious Injury Accident East of Flagstaff January 18, 2025 SPONSORED FREE POST 8:17 PM Summit FD and State Troopers are responding to an injury accident on Interstate 40 westbound at mile marker 214. This is 13 miles east of Flagstaff. One semi is on its side and blocking all.lanes of westbound traffic.