Road closures for the Cap 10K begin at 3 a.m. near the start line with the race starting at 8 a.m. on the South Congress Avenue at the Ann Richards Bridge over Lady Bird Lake.
The course will be closed to traffic by 7 a.m. and roads will be reopened on a rolling schedule following the last participant.
The race ends at 12 p.m. on West Riverside Drive at Vic Mathias (Auditorium) Shores.
For the exact details about which roads will be closed you can go here (pdf).
For more information about the race including parking and transportation to the race you can go here.