Common traffic signs are red for stop, yellow for ready, and green for go. Traffic signs are generally classified into four categories, which are: regulatory, warning, guidance, and temporary.
There are four subcategories under the regulatory type of traffic signs, which are: control, command, prohibition, and reservation. Control signs give specific instructions, for example, a round red sign with a white bar across it means no entry. Command signs direct you to drive in a particular way, for example, a blue sign with a taxi on it indicates that only taxis are permitted to use that lane. Prohibition signs tell you that you are not allowed to drive in a certain way shown on the sign. Reservation signs are used to inform vehicle drivers that only certain types of vehicles are allowed to use that lane or area (e.g trucks).
There are two subcategories under the warning type of traffic sign: road layout and direction of movement. Road layout signs are used to warn drivers that there are changes to the road layout ahead, for example, a triangular warning sign with the letter “T” on it means that there is a T-junction ahead. The direction of movement signs warns drivers to anticipate something like other road users ahead, like cyclists.
The two subcategories under the Guidance traffic signs are location and route markers. The location signs in the form of highway symbols let you know what road you are traveling on and where you are. The route markers are green signs with names of towns or places nearby with numbers to let you know how far you have traveled in kilometers.
Prohibition and warning signs are subcategories of temporary traffic signs. While prohibition signs prohibit you from driving for example, above a certain speed level; warning signs can be used to inform drivers of an accident scene or an ongoing construction ahead, for example, a yellow triangular sign with a man digging indicates a construction work ahead.
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