Yes. See the link for different types of highway warning signs.
Yes. A speed limit sign is an example of a regulatory sign.
Regulation Sign Example will be the Speed Limit 50
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jheA speed sign is an example of a regulatory traffic sign. The Interstate system in the United States has both a maximum and a minimum speed requirement.Regalutory signRegulatory sign.
A warning sign
RegulatoryAdditional Information: (in the US) If it is black lettering on a white background it is regulatory.If it is is black lettering on a yellow background, and usually accompanied by a road condition sign it is advisory.
In the UK the speed limit comes into force as soon as you pass the speed limit sign. As such the distance is zero as you should have slowed down to the posted speed limit before passing the sign.
warning
When it is flashing the speed posted is the limit
A motorist is expected not to drive faster than the speed limit on the sign until the school has been passed.
It is unknown who invented the speed limit sign. However, the first maximum speed limit was the 10mph (16km/h) limit introduced in theUnited Kingdomin 1861.
It varies by jurisdiction.