GREEN BAY, Wis. (AP) -

This year could end as one of the safest on Wisconsin roads since World War II.

Through Sunday, 519 people have died in motor vehicle crashes on the state's roads. Four of those deaths were in La Crosse County.

Last year, the state saw 601 deaths. Law enforcement officers say a number of factors play into the decrease including new laws, like the Graduated Driver's Licensing, which went into effect for teens in 2000.

"Traffic crashes for teens since the Graduated Driver's Licensing went into effect were down about 15% from where they were pre-law," said Wisconsin State Patrol Trooper Chad Thompson. "Also in 2009 the seat belt law became a primary enforcement law where you can be stopped just for the seat belt violation. Prior to that we had to have another reason to stop you."

Wisconsin's average for seat belt use is about 80-percent, a 23-percent increase from prior to the law. However, the state still lags behind the National average of 86-percent.