Related Clues:

• Parkers plug them
• Long jump measure
• Marks along some swimming pools
• Curbside sights
• They may be running along a street
• They're fed at curbside
• Taxi devices
• Gauges
• Maids tend them
• Cab components
• They line some streets
• Swimming measurements
• Quantity calculators
• Receivers of spot payments?
• Taxi parts