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Residential...don't need that much detail
That varies between states, who have jurisdiction to set speed limits in their respective state.
Some major highways in Louisiana include I-10, I-20, I-49, and I-12. These interstates connect major cities like New Orleans, Baton Rouge, and Shreveport, and provide important transportation routes throughout the state.
Yes, for the simple reason that there is no such thing as a "federal speeding ticket". The federal government has no police force that controls federal highways. That control is left to the states.
No.
The acronym FHWA stands for the Federal Highway Administration of the United States of America. The Federal Highway Administration is responsible for maintaining highways and roads.
There are many places where you can find United States maps and interstates. You could look at your local library.
The federal government can't make the states change their laws, but they use grants as incentive for the states to make the states laws what the federal government wants. They offer grants for the roads for states to change the speed limit on highways to 65 mph.
federal because it deals with commerce between various different states
The Federal Government can withhold Federal tax dollars for highways for states that post higher speed limits on the Interstate than what the Feds suggest.
State highways typically have a two-digit number, while federal highways often have a three-digit number with the prefix "US." In addition, federal highways are usually major routes connecting cities and states, while state highways tend to be within a specific state's boundaries.
Here in the states they are called, highways.