55
45 MPH
scalar
An Autobahn is basically a German version of a highway. ******** A VERY high speed highway- such as an expressway or an interstate highway.
70
A scalar, since no direction is specified.
69
A US highway is an all access highway, like a main road; it includes businesses, houses, and direct intersections. Top speeds on the average US highway are 55 mph. An interstate highway is a limited access highway that is meant for commute. It includes no property entrances, and interchanges at high speed. Speeds range from 65 to 75 mph (about 90 to 105 km/h).
around 65m.p.h on the straightaways
55, in the city, 65 or 70 outside of the city. (U.S.)
The highest speed limit I know of on an Interstate highway in the U.S. is 75 MPH, but that varies.
When you enter an interstate highway, you must use the acceleration lane to merge smoothly with traffic. It's important to signal your intention to merge and adjust your speed to match that of vehicles already on the highway. Always yield to traffic already on the interstate and ensure you have a safe gap before merging. This helps maintain safety and flow on the highway.
70 mph - but some states do not allow that speed.