In ASC territory, which term allows up to 40 mph under cab signals while normally up to 30 mph elsewhere?

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

Answer: (B)

Maximum Authorized Speed is the speed limit set for a specific track segment by the signaling system and dispatcher. In ASC territory, the cab signals can authorize speeds up to 40 mph, while outside ASC the typical limit is 30 mph. This term names the highest speed you’re legally permitted to operate on that segment under the authority of the signals, regardless of other conditions. Other terms describe more restrictive rules or different operating contexts, but they don’t define the ceiling speed that signaling can authorize in ASC territory.