A man “with more than 60 years’ driving experience” admitted driving without due care and attention after causing a crash on the A1 at Skillington.
David Cressey, 76, of Parklands Drive in Harlaxton, pulled out from the central reservation on the dual carriageway and was hit from behind by another car.
Cressey admitted the offence via a letter to the court.
He wrote: “It seems I was in the wrong and pulled out too early into the carriageway, causing the collision.
“I must have paid too much attention to the HGV and did not see the car.”
Cressey added: “I apologise to the young lady and the public for my error.”
The court heard the other driver in the collision suffered bruising to her chest, back and neck.
Cressey was fined £200 and must pay a £20 surcharge and £43 in costs.
He also received five points on his licence.