The biker -- going full speed -- had zero chance of stopping or swerving to avoid the accident, slamming right into the woman, sending both crashing to the asphalt.
Both received medical attention on-scene.
The biker, who was transported to a local hospital, reportedly suffered head injuries and memory loss. The woman's condition after receiving treatment is unknown.
The racecourse was blocked off with barriers ... but unfortunately, some fans decided to get a closer look.
In fact, seconds before the collision you can see another spectator walk across the course. Thankfully, they weren't also hit.
It's not the first time we've seen a nasty spill at a race. Back in June during the first stage of the Tour de France, an overeager fan took out a rider with a sign, causing a chain reaction that took out multiple cyclists.