What can substitute a Stop Sign when the track is not obstructed?

What can substitute a Stop Sign when the track is not obstructed?

• A. Working Limits Speed Limit Sign
• B. Yellow Flag
• C. Stop Sign Sign
• D. Green Light

Answer: (A)

The key idea is that when the track is clear and you’re operating under working limits, a Working Limits Speed Sign tells you to proceed and at what speed. It effectively replaces the need to stop at a Stop Sign, because there’s no obstruction and you’re authorized to move through the block at the indicated speed. The other options don’t provide a general go signal: a Yellow Flag is for flag protection or caution around work, not a normal go-through instruction; a Stop Sign requires stopping; and a Green Light isn’t a NORAC substitute for a Stop Sign.

The key idea is that when the track is clear and you’re operating under working limits, a Working Limits Speed Sign tells you to proceed and at what speed. It effectively replaces the need to stop at a Stop Sign, because there’s no obstruction and you’re authorized to move through the block at the indicated speed. The other options don’t provide a general go signal: a Yellow Flag is for flag protection or caution around work, not a normal go-through instruction; a Stop Sign requires stopping; and a Green Light isn’t a NORAC substitute for a Stop Sign.