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Some hitchhikers also use flash or blinking lights to draw the attention of drivers. This can work rather effectively. When done in the right way, that means to start using the flash when an approaching car is about five seconds away, most drivers drop their speed for example from 80 to 40 kmh. They are very attentive at that moment and especially keen on getting to know if they will be obliged to stop (by police for example). When done at the very right moment, a decided gesture will bring some of those drivers to stop. The technique has been described in detail on [this page http://archive.today/w3WjL] of [[Vilnius Hitch-hiking Club|VHHC]].