What traffic management service is operated by the U.S. Coast Guard in designated waters to prevent collisions, groundings, and environmental harm?

• A. Vessel Traffic Service (VTS)
• B. Ship Traffic Control (STC)
• C. Automatic Identification System (AIS)
• D. Maritime Safety Administration (MSA)

Answer: (A)

Vessel Traffic Service is the traffic management service operated by the U.S. Coast Guard in designated waters to prevent collisions, groundings, and environmental harm. It works by continuously monitoring vessel movements with radar, AIS data, radio communications, and other sensors, then providing information, warnings, and instructions to mariners to organize traffic safely. In busy waterways and approaches to ports, VTS centers can direct ships to adjust speed, alter course, or use specific routes to avoid conflicts and protect the environment. The other options don’t fit because AIS is a tracking system used to share vessel information, not an active traffic management service; Ship Traffic Control is not the Coast Guard’s designated name for this service; and Maritime Safety Administration is not a U.S. agency or term used for this function.