Multiple brush fires burned along State Route 512 in Puyallup Saturday afternoon, causing big backups for south sound drivers.

The fires started around 2 p.m. and stretched from Canyon Road to S Merdian St.; blocking lanes and affecting traffic in both directions.

According to WSP Trooper Brooke Bova, a motor home's exhaust may have sparked the fires. Troopers were investigating the cause of the fires.

Within an hour, firefighters had the fires under control and lanes were reopened.