Drivers said surfacing materials being used on State Road 252 in Johnson County caused cracked windshields and chipped paint, 6News' Stacia Matthews reported.

A mixture of oil and rocks was used along a stretch of road through Trafalgar, but the loose rocks were blamed for the damage.

Indiana Creek Schools wants INDOT to cover the cost of damage to the school buses.

The issue began two weeks ago, when drivers began reporting rocks flying up at them while on bus routes.

Jim Singleton, transportation director at Indian Creek Schools, said 11 buses in his fleet were damaged.

"It could (get expensive) replacing windshields," Singleton said. "The glass is approximately $300."

Singleton said the windshields on four buses have been replaced and that crack repairs to others cost $50 each. Two headlights also had to be replaced.

Gary Vandergriff, of INDOT, said loose gravel is a product of chip and seal resurfacing, which is about 25 percent less expensive than repaving and lasts up to seven years.

Vandergriff said motorists can avoid flying rocks if they follow the 35 mph speed limit and take extra precautions in the construction zone

"There would be significant impact if people would just slow down in the construction zone," he said.

The school district is paying its insurance deductible to cover the cost of repairs, but Singleton thinks the state should pay.

"Since the state put the chip and seal on the road, we think maybe they are liable to pay for this," he said.

Anyone who wants to file a damage complaint should send a form with pictures or other documents to the Attorney General's Office. An investigation takes 90 days.