It’s Bus Route 405 that’s affected. Apparently getting too dangerous after dark:
The loop over Southern Oaks Boulevard and Overton Road will not be served after 8 p.m. Southbound buses will operate over Overton Road to Illinois Avenue and continue to Ledbetter Station. Service northbound to Southwestern Medical District/Parkland Station will travel the same route in reverse. The normal route will be operated at all other hours (please see map below).
The detour is prompted by safety concerns for bus operators and passengers and will remain in effect until further notice.