Restricted speed permits stopping within what fraction of the range of vision?

Restricted speed permits stopping within what fraction of the range of vision?

• A. One-half the range of vision.
• B. One-quarter the range of vision.
• C. The full range of vision.
• D. No specific fraction.

Answer: (A)

Restricted speed means you must be able to bring the train to a stop within the distance you can see ahead. For this item, that distance is defined as one-half of the range of vision. The idea behind using half the range is to provide a safety buffer: even as you travel at a restricted pace, you need to be able to stop before you reach any obstacle that lies within what you can see, while accounting for braking performance, reaction time, and variable conditions. So, if you can see 2,000 feet ahead, at restricted speed you should be able to stop within about 1,000 feet. The actual stopping distance depends on speed, track conditions, grade, weather, and how your braking system responds, but the standard guideline uses half the range of vision to set a safe, consistent threshold.

Restricted speed means you must be able to bring the train to a stop within the distance you can see ahead. For this item, that distance is defined as one-half of the range of vision. The idea behind using half the range is to provide a safety buffer: even as you travel at a restricted pace, you need to be able to stop before you reach any obstacle that lies within what you can see, while accounting for braking performance, reaction time, and variable conditions.

So, if you can see 2,000 feet ahead, at restricted speed you should be able to stop within about 1,000 feet. The actual stopping distance depends on speed, track conditions, grade, weather, and how your braking system responds, but the standard guideline uses half the range of vision to set a safe, consistent threshold.