A BMW driver doing 60mph in a 30mph zone failed to stop at a police checkpoint at Belfast Road, Ballynahinch, at 12.35am on March 8 this year.
Shane McParland (26), of Manse Road, Carryduff, admitted charges of failing to stop for police and excess speed.
A prosecutor told Downpatrick Magistrates Court police were conducting a speed checkpoint and detected the defendant doing 60mph.
An officer used a lit torch to signal the defendant to stop but the vehicle continued through the checkpoint where police were wearing high-visibility jackets.
Police checked the address of the vehicle and then spoke to the defendant.
Defence barrister Caitriona Keenan said the defendant already had six penalty points.
She said on March 8 it had been "late at night and the road was quiet, however, he knows there is absolutely no excuse and he recognises the serious consequences that his driving could have had and the speed he was doing".
The lawyer said the defendant said he "just didn't see" police and if he had been followed at the time he would have pulled in for officers.
District Judge Amanda Brady said the defendant was "doing twice the speed limit and he didn't stop" and handed down five penalty points and a £300 fine.
- Main picture: A general view of the Belfast Road in Ballynahinch. Picture: Google Maps.