Sometimes it doesn't take that much to really slow things down.
https://en.wikipedia.org/wiki/U.S._Route_101#California
Unfortunately, the California_Highway_Patrol can't keep watch of every mile, every minute of the day. It's just not possible.
https://en.wikipedia.org/wiki/U.S._Route_101_in_California#Central_Coast
https://ca.finance.yahoo.com/news/3-fires-along-highway-101-231243341.html#
