A freeway, or an expressway.
no
No, they are not.
It separates two lanes traveling in the same direction
The speed limit for vehicles merging onto the highway from an on ramp is typically the same as the posted speed limit for that section of the highway.
Every state has state highway patrol. However, some states have different names for them, but they function as the same thing.
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Highway Hypnosis
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A car's engine will turn higher RPM (rotations per minute) on the highway due to the increased speed needed to travel at highway speeds. A car does not need to have it's engine spin at the same RPM level on the city street as it does on the highway.
Yes always 2 seconds.
Its nothing!
Synonymous with? No. That would mean highway laws and constitutional law were the same, and interchangeable with one another. Maybe the word you're looking for is "analogous"?