When the truck starts any movement after a stop condition longer than 10 s, a visible and/or acoustical warning signal shall be activated at least 2 s, prior to the start of any movement, including any moving part of the truck (e.g. forks, conveyors, parts protruding from the load). A visible and/or acoustical warning signal shall be active during any movement, including any moving part of the truck (e.g. forks, conveyors). This signal may be the same signal as the prior to the start warning signal.
The visible and acoustical signal shall be designed taking into account the environmental conditions (e.g. noise, light, brightness).