He was travelling along the A614 near Thorne in South Yorkshire when he had to brake to avoid an oncoming vehicle.
The rider suffered an injured shoulder and tissue damage.
A Humberside Police spokesman said: "We are keen to speak to anyone that may have seen the incident, in particular the driver of the vehicle being overtaken at the time, which is thought to have been a van or possibly something towing a high sided trailer."
Anyone with information should call Humberside Police on 101.