TRENTON - Police are not sure why more people have died on New Jersey highways this year compared to the same period in 2010.

State Police figures show there have been 314 traffic fatalities so far. That's a 9.8 percent increase over the same period a year ago.

Essex County led the state with 32 fatalities. It was followed by Burlington and Middlesex with 28 each. Camden had 27 and Ocean had 25.

There were 556 people killed on New Jersey roads in 2010, the lowest number since the 1940s.