I think that you mean "Why does the US need traffic laws?"
Because then people like don't go 120 mph on a school zone and then horribly maim several blind and deft small wheelchair bound 1st graders.
They are very different than in the US. As traffic laws are dictated by each state, they are also going to be different in the many cities you go to in Spain.
traffic laws are usually formulated?
It is a violation of the Traffic Laws, yes.
You can find road traffic laws at online shop that provides you road traffic laws with many choose of road traffic laws such as ebay.com, amazone.com etc. just try to visit www.ebay.com to find road traffic laws.
There are many traffic laws in Colorado. you can find one of traffic laws is at online shop such as ebay.com, amazone.com etc. just try to visit www.amazon.com to find traffic laws in Colorado.
traffic laws are in place to keep the road and the drivers on it safe.
The law depends on where you are, not where you are from. Canadians must obey US traffic laws when in the states.
False
As of May 2013, there are 12 states that have passed legislation which ban the usage of speed cameras in traffic. Other states have laws that limit use, and some have no laws that mention such cameras.
The best site to learn about traffic laws is at autostatelaws dot com. That site has the list of all states and their associated traffic laws. Good information there.
obey ALL the traffic laws
Yes, bicycles are considered vehicles according to traffic laws.