| You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound? |
| A) Sound the request-for-opening signal twice in succession to indicate you must pass through both bridges |
| B) Sound the request-for-opening signal, pause for about 10 seconds, then sound two prolonged blasts. |
| C) Sound the request-for-opening signal for the first bridge only, who will notify the second bridge of your approach |
| D) Sound the request-for-opening signal and, after the bridge acknowledges it, sound the request-for-opening signal for the second bridge. |
