The incident is thought to have happened after the driver of the vehicle pulled out of a petrol station.
Garage attendant Yasmin Smith, who saw Wiggins shortly after he was knocked over, told BBC Sport: "I was in the office and I heard a screeching of tyres and a bang.
A Lancashire police spokeswoman confirmed to BBC Sport: "...but the driver of the vehicle is not injured."
Well, pheeeyuw!thank goodness the van driver is OK!