Deck 2014: Rules of the Road

1. A One prolonged blast followed by two short blasts at intervals of not more than two minutes
2. B Five second ringing of a bell at intervals of not more than one minute
3. C Four short blasts at intervals of not more than two minutes
4. D Five second ringing of a bell and five second sounding of a gong at intervals of not more than one minute

Tip: press A-D to answer