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AGOURA HILLS (CNS) - The annual Amgen Tour of California bike race arrives in Los Angeles County this Friday, with major road closures planned in the Santa Clarita and Antelope valleys, the San Gabriel Mountains and, on Sunday, in the mountains near Malibu.

The bicycle race's first stage was in Sacramento, and race stages have moved south towards Los Angeles County all week.

Motorists can expect crowds and brief road closures along the race.

On Friday, racers will start in Santa Clarita and head up Bouquet Canyon through Little Green Valley and into Palmdale. Racers will then cross the Antelope Valley and then use Big Pine Highway and Table Mountain Road to finish at Mountain High North.

Saturday's race will start at the Town Center mall, also in Santa Clarita, and then head to Acton before turning south on Angeles Forest Highway, and then Upper Big Tujunga Road.

After descending into La Canada-Flintridge on Highway 2, the racers on Saturday will head into Old Pasadena, and make three laps on downtown Pasadena streets before finishing at Pasadena City Hall.

Sunday's final stage will see the riders making three circuits on a course that starts in Thousand Oaks and then winds into Agoura Hills, before turning south to Mulholland for a steep climb past the ``Rock Store'' on Mulholland near Malibu Lake.

After winding along Mulholland and again crossing Kanan-Dume Road, the riders will descend back into the Conejo Valley via Westlake Boulevard.

Because the riders are making three circuits, traffic in Thousand Oaks, Westlake Village, Agoura Hills, and the mountain roads north of Malibu can be expected to be jammed midday Sunday.