State Route 12 stretches for 140 miles, east to west, with scenic views of Sonoma, Calaveras and San Joaquin counties. But there's a section from Lodi to Fairfield that locals call "Blood Alley" because of all the crashes that happen along the narrow two-lane road.

CHP data show that from 2009 to 2011 there were more than 100 crashes killing six people and injuring 90.

Officials say it's a dangerous stretch because impatient drivers get the urge to pass the large number of big rig trucks on the road and when cars ahead of them slow down to turn.

The CHP's Valley Division is deploying extra officers to crackdown on speeders and unsafe passing. Money to pay for those extra patrols comes from a federal grant titled "Reduce Aggressive Driving Incidents and Tactically Enforce Speed" or RADIATES. Valley Division will also deploy radar trailers and use its Air Operations unit.

The zero tolerance enforcement operation started today and runs through Sunday.