outskirter
/ˈaʊtˌskɜːrtər/Definitions
1. noun
A person who rides a cycle or motor vehicle on the extreme outer edge of a procession or group.
“The police tried to chase down the outskirter, but he managed to evade them.”
2. noun
A cyclist who rides at the side of a group or procession, often to protect the group from traffic.
“The outskirter was responsible for keeping an eye out for any potential dangers on the road.”