🔍 Key Concepts

• 33 CFR 117.15 – Signals for opening drawbridges • Difference between signals meaning “bridge will open promptly” vs “opening is delayed / cannot open immediately” • Typical color meanings for red, white, and amber lights in navigation and traffic control

💭 Think About

• Which signal in the list is commonly associated with a delay, caution, or standby rather than a clear go/stop? • Look up 33 CFR 117.15 and match each choice with the regulation’s exact wording about how a bridge acknowledges but delays an opening. • Ask yourself: which of these signals would logically mean, "I got your request, but you must wait" rather than "I will open now" or "I’m closed."

✅ Before You Answer

• Verify the exact description of bridge light signals in 33 CFR 117.15, not general traffic lights. • Confirm which signal the regulation ties to the phrase “draw will not be opened immediately” or similar wording. • Make sure you distinguish between signals that mean “fully closed,” “opening promptly,” and “delay/stand by.”