ZIONSVILLE, Ind. (AP) — An Indiana state trooper was badly injured when a car hit him along Interstate 865 in suburban Indianapolis.

State police Sgt. John Perrine says the trooper was outside his patrol car during a traffic stop on the highway's shoulder when he was hit about 9 a.m. Wednesday.

He says Trooper Ronneal Williams was about to make a radio call for help and was taken to a hospital in serious but stable condition. The other driver was taken to a hospital with less serious injuries.

Perrine says the car crashed into the trooper's car and them impact knocked Williams over the guardrail along I-865 near its interchange with I-465 just northwest of Indianapolis. Perrine said the patrol car's emergency lights were on when the crash happened.