Marietta resident Ray Keefer was already aware of the new traffic laws that will be enforced starting Friday - in fact, he already practices one of them regularly.

"If you have your wipers on, the visibility must be down. If you've got fog, rain, snow, whatever, you need the lights to penetrate," Keefer said.

Starting Friday, Ohioans can be ticketed and fined $100 for failing to turn on their lights when their windshield wipers are operating. Law enforcement has only been issuing warnings in the first six months since the law took effect.

Washington County Sheriff Larry Mincks said motorists must turn on their headlights when the windshield wipers of the vehicle are in use anytime, whether there's rain, mist, snow, ice or fog.

Mincks said the sheriff's office has already been giving warnings and will continue to do so at the discretion of the officer.

"I'm sure officers will be talking to (motorists) and advising them," he said. "We'll be giving some warnings until everyone becomes aware of it, unless it's an aggravated situation like it's a driving rain and they're going down the road without their headlights on or they caused an accident."

Marietta police Sgt. Greg Nohe said city law enforcement will take a similar approach.

"It's not something that's heavily enforced unless it's in a traffic crash," he said. "The warning is their education."

Nohe and Mincks both said their respective departments do not keep track of warnings issued to motorists for such offenses.

The wiper law is a secondary offense, meaning motorists cannot be pulled over solely for failing to obey the new law. They must first be pulled over for something else, such as speeding, before they can be ticketed and fined for not using their headlights.

Also starting Friday, law enforcement officers can begin issuing fines of up to $75 to drivers who don't put children ages 4 through 7, or shorter than 4 feet, 9 inches tall, in a booster seat. As with the headlight law, this is a secondary offense.

Sgt. Anne Ralston, with the Marietta post of the Ohio Highway Patrol, said troopers always have discretion when it comes to issuing such citations. However, she said there is little tolerance for seat belt and child safety seat violations and she expects a similar approach for booster seats.

"We look at that very much the same as the safety belt and also the child safety restraint," Ralston said.

Ralston said she personally has not witnessed many violations of the booster seat law locally.

Evan Bevins contributed.