Lights & Signals Test

Light configurations follow Rules 23 to 30, arcs Rule 21, visibility ranges Rule 22, day shapes Rules 24 to 30 and sound signals Rules 32 to 37, as carried verbatim in Appendix B (MISCPUB 0127). Lights mode mixes picture identification with questions on aspects, arcs, ranges and Rule 20. Sound playback timing is stylised for practice: a short blast is about one second, a prolonged blast four to six, and fog signal intervals are far longer than shown here. Answer with keys 1 to 4; space replays a sound.