Police say Daniel Odubanjo forced himself into the toilet, before the victim screamed for help.
Police say officers are "pursuing several lines of inquiry to identify and locate further suspects".
A lorry and a van collide on the A12 at Witham.
Detectives appeal for people with information about the collision to come forward.
A total of eight Essex-based winners are named during a ceremony in Hatfield Peverel.
Winners in eight categories will be selected at a ceremony in Hatfield Peverel.
Officers are appealing to find anyone who saw a Black Kia Picanto in the area before the crash.
Essex Police says the road is closed to all traffic in the northbound carriageway.
Harry Pyett, 19, believes it should be mandatory for bikers to wear protective clothing.
