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A regulated speed sign is always white with black lettering and the words "Speed Limit" are on the sign. This sign is yellow and is considered an "Advisory" or caution sign. In a form of exploitative, lowbrow comedy, the signs quite often provide fodder for humor at the expense of mentally disabled children (a play on the word "slow").
Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones . Later, signs with directional arms were introduced, for example the fingerposts in the United Kingdom and their wooden counterparts in Saxony .
Once the traffic has stopped, one student verbally instructs pedestrians to cross the road. One of the two students leads the crossing with a series of verbal calls. When a gap in the traffic appears the leader calls "signs out" (both signs are extended onto the road). "Check" (Both students check that traffic is stopping/stopped).
Signs including Stop, Yield, No Turns, No Trucks, No Parking, No Stopping, Minimum Speed, Right Turn Only, Do Not Enter, Weight Limit, and Speed Limit are considered regulatory signs. Some have special shapes, such as the octagon for the Stop sign, the triangle for the Yield sign, and the crossbuck for railroad crossings.
Polish road signs depict people with stylized (as opposed to naturalistic) silhouettes. Meaning of the traffic signals and their usage is described in another regulation. Traffic signals are placed on the right side of the road, on the left side or over the carriageway. There are three types of traffic signals: signals made by traffic lights
Stop sign placement can pose difficulties and hazards in applications where cross traffic is not controlled by a sign or light. Relatively long distance between the stop sign and the crossroad facilitates accurate perception of the speed of approaching cross traffic, but lengthens the time and distance required to enter and clear the junction.
Roads can be motorways, expressways or other routes. In many countries, expressways share the same colour as primary routes, but there are some exceptions where they share the colour of motorways (Austria, Liechtenstein, Hungary, Switzerland, Spain, Sweden) or have their own colour (the countries comprising former Yugoslavia employ white text on blue specifically for expressways).
These warning signs indicate that traffic lights are ahead, and are often used when it is difficult to see that a traffic light may already be showing red, to warn a driver to prepare to slow down. They may be supplemented with flashing light or lighted sign when light is red or turning red.