West Mercia Police are appealing for witnesses following a collision on the A49, Hope-under-Dinmore in Herefordshire on Monday 14 August.
At around 4.20pm a black Honda motorbike and a white Renault Kangoo van collided.
The driver of the van was suffering from shock and attended A&E, the motorcyclist was airlifted to the QE hospital in Birmingham and remains in a serious condition.
Officers would like to hear from anyone who was in the area at the time who may have seen the collision or may have dash-cam footage of the incident.
Anyone with information is asked to contact PC Prosser by email nicholas.prosser@westmercia.pnn.police.uk or by calling 07773054723
You can also anonymously contact the independent crime-fighting charity Crimestoppers on 0800 555 111 or through their online form: https://crimestoppers-uk.org/give-information/forms/give-information-anonymously