A large crowd of people on motorcycles and several dozen cars wait behind a crosswalk .
The bicyclists like to race on mountain trails .
A large crowd of people on motorcycles and several dozen cars wait behind a crosswalk.
The bicyclists like to race on mountain trails.
He refers to people on motorcycles not bicyclists. They cannot be behind a crosswalk and on mountain trails simultaneously.
He refers to people on motorcycles not bicyclists . They can not be behind a crosswalk and on mountain trails simultaneously .