The Texas Department of Public Safety is investigating an incident on Highway 6 in Grimes County that injured a bicyclist on Thursday morning.
Around 8:25am, troopers say a man on a bicycle was in the right-hand shoulder of the highway northbound and attempted to cross over to the left shoulder.
When the bicyclist did this, troopers say he struck the rear of the trailer.
The bicyclist was flown by medical helicopter to CHI St. Joseph Regional Hospital with suspected serious injuries.
There is no additional information to release at this time.