Related Clues:

• Heeds a roadblock
• Organ pieces
• Bus-route locations
• Brings to a halt
• Bus-route sites
• Calls off
• Places where boards are made?
• They're located on organs
• Train line list
• Hits the brake
• Reaches the end
• They're on organs
• They prevent flights from being direct
• Dots on a subway map
• Timetable listings