Outside interlockings, what is the maximum speed under restricting speed rules?

Outside interlockings, what is the maximum speed under restricting speed rules?

• A. 20 mph
• B. 15 mph
• C. 25 mph
• D. 30 mph

Answer: (A)

Restricting speed is the controlled, reduced speed you must maintain when a signal or track condition requires extra caution so you can stop within the available distance ahead. Outside interlockings, the maximum is 20 mph. This limit provides enough braking and reaction time if you encounter a stop signal or obstruction in the block, ensuring safe progression without excessive traffic stoppage. Higher speeds would cut into the stopping margin needed under these restrictions, which is why they aren’t allowed in this scenario.

Restricting speed is the controlled, reduced speed you must maintain when a signal or track condition requires extra caution so you can stop within the available distance ahead. Outside interlockings, the maximum is 20 mph. This limit provides enough braking and reaction time if you encounter a stop signal or obstruction in the block, ensuring safe progression without excessive traffic stoppage. Higher speeds would cut into the stopping margin needed under these restrictions, which is why they aren’t allowed in this scenario.