Izibane zendlela azikho nje ulwimi olusisiseko lwendlela yokuhamba, kodwa kunye nenxalenye ebalulekileyo yomyalelo wesignali yendlela. Isetyenziswa kakhulu kumacandelo eendlela eziyingozi ezinje ngohola wendlela, iikona, iibhulorho, njl. njl., inokukhokela itrafikhi yabaqhubi okanye abahamba ngeenyawo, ikhuthaze itrafikhi, kwaye inqande ...
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