Which term applies to a speed not exceeding 15 mph, with cab signal indicator not to exceed 30 mph in ASC territory?

• A. Restricted Speed
• B. Limited Speed
• C. Maximum Authorized Speed (MAS)
• D. Medium Speed

Answer: (A)

Restricted Speed is the term that fits this scenario. It describes operating at the slow, cautious pace required when you must be able to stop within the range of vision and be prepared to stop for any obstruction, especially where signals or track conditions demand extra caution. In ASC territory, the cab signal may indicate up to 30 mph, but on segments where conditions require it, you must still limit yourself to the lower, around 15 mph threshold. That combination—very slow speed with a cab-signal-imposed ceiling—defines restricted speed.

Limited Speed, Medium Speed, and Maximum Authorized Speed refer to higher speed ranges or different signaling rules, so they don’t match this particular, very cautious operating condition.