It was during a training camp in Spanish Alicante that the accident happened.
She was in Spain with the Dutch national team this week and lost consciousness after the collision, reports the BBC.
Amy Pieters was picked up by ambulatory helicopter.
According to the BBC, the star has undergone an operation to relieve the pressure on the brain that arose from the accident.
The Dutch Cycling Federation announces that she has been placed in an artificial coma.
The 30-year-old recently became, together with Kirsten Wild, world champion in the velodrome cycling branch Madison for the third year in a row.