The incident happened in Old London Road on Friday evening (January 21).
Police said the road was closed for several hours as emergency services attended the scene.
“The road was closed for around five hours while fire crews extracted the casualty and paramedics treated him at the scene.
“The driver of the vehicle, a 66-year-old man, was taken to hospital with serious, potentially life-changing injuries.
“Anyone who witnessed the collision or has information officers which could help officers with their investigation is asked to report it to [email protected] or call 101 quoting serial number 1115 of 21/01.”