Emergency services were called to the Federal Highway at Sutton about 8.15am, and found the male cyclist had died at the scene.

The male driver of the truck was taken to Queanbeyan Hospital for mandatory testing.

On Saturday afternoon, a NSW Police spokesman said an investigation into the crash was ongoing and it was not yet clear whether charges would be laid.

Police closed the road southbound after the crash and officers were diverting traffic onto the Federal Highway Service Road. A significant amount of traffic had banked up and was snaking back down the highway.

All lanes had reopened by 2pm on Saturday.

Several hours after the incident, a damaged bicycle was still visible on the side of the road, with a plain white truck parked further up while police attended the scene.

Riding along the Federal Highway after the incident was Greg Little, who said he had ridden that stretch of road for five years and hadn't experienced any issues or seen any close calls with cyclists.

"You get the odd moron that honks their horn," Mr Little said.

"Most drivers are pretty good though, especially in Canberra with the new road rules."

Mr Little noted it was particularly windy on Saturday morning.

"I've been blown all over the place today," he said.

- With Blake Foden