Police are appealing for witnesses following a crash between a car and two motorbikes in Batley.
Emergency services were called out to Track Road at 5.48pm on Wednesday, June 8.
The collision involved a black Honda car and two bikes which were not road legal.
West Yorkshire Police and Yorkshire Ambulance Service attended and treated one of the motorbike riders, who was initially unresponsive.
The biker regained consciousness after receiving medical attention at the scene.
He was taken to hospital for further assessment of his injuries, which are not believed to be life threatening.
The second rider suffered minor injuries.
Enquiries are ongoing into the collision, the force said.
Anyone who witnessed the incident or the movements of the vehicles prior to it is asked to contact the Roads Policing Unit on 101.
People can also use the LiveChat facility on the West Yorkshire Police website, quoting log reference number 1280 of June 8.
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