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

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Multiple Choice

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

Explanation:
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.

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