Although you should know about and be able to use arm signals in place of, or to reinforce indicator signals, if the indicators fail during a driving test, the test will be abandoned (even if you volunteer to use arm signals).

If you are able to rectify the fault within a few minutes by changing a bulb, then the test could continue.

To this end and for the purpose of daily and weekly checks it is essential that you recognise and respond to clues that suggest a problem with the indicators.