Caltrans contractors will be tearing down the overpass at the Poway Road/Rancho Penasquitos Boulevard interchange.
Both directions of the 15 will be closed beginning at 11:30 p.m. this Tuesday, Wednesday and Thursday nights. The freeway will reopen at 4:30 a.m. Wednesday, Thursday and Friday.
Detours will be posted, but heavy traffic can be expected, the state agency warned. The detour will use both Route 56 and Black Mountain Road, west of Interstate 15.