Mostly they are semi-automatic without lock-keepers, but they are simple to use. A hundred metres or so before the lock a perche (pole) dangles above the canal at boat height; as you reach it you twist it a quarter of a turn which triggers a switch to set the process in motion. The lock will then prepare itselfrn(emptying if necessary) while 'traffic' lights (feu d'acces) remain red. Once the lock is ready the lights turn green and the gates open.
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