This report examines the policies and strategies governing the design and, especially, operations of bus lanes in major congested urban centers. It focuses on bus lanes that operate in mixed traffic conditions. Four key questions addressed in the paper are: 1. How do the many public agencies within any city region that share authority over different aspects of the bus lanes coordinate their work in designing, operating, and enforcing the lanes? 2. What is the physical design of the lanes? 3. What is the scope of the priority use granted to buses? When is bus priority in effect, and what other users may share the lanes during these times? 4. How are the lanes enforced?