a portion of the roadway designated for bicycle use

a portion of the roadway that has been designated by striping, signing, and pavement markings for the exclusive use of bicyclists

A portion of a street reserved for use by bikes, usually separated from general purpose lanes by a stripe of paint and signage.

A lane for bicycles that is part of the road, almost always marked with a paint stripe that separates the bike portion from the auto portion. An extended shoulder that is marked with a paint stripe. This book does not cover these.