Obey posted signs and lane indicators, maintain a safe following distance from the vehicle in front of them.
The federal department that administers grants to states for highway construction through the Federal Highway Administration (FHWA) is the United States Department of Transportation (USDOT). The USDOT oversees transportation-related policies and programs at the federal level, and the FHWA is one of its key agencies responsible for managing and distributing federal funds for highway infrastructure projects across the country. The FHWA works closely with state departments of transportation to allocate and administer grants for highway construction, maintenance, and improvement projects
An interstate highway is one that runs across the US, normally across several states (hence inter-state). The US Interstate Highway System is the system of federally-built roadways that began construction in the 1950s, originally as a way to improve the flow of essential military material.
the highway from america to africa was hard to bulid across the ocean
The correct spelling is "opposite" (the reverse, or across from).
Apart from the snow deposited in a layer, that can imped traffic if thick enough, the main hazard after a blizzard is snow drifts. A snow drift of several feet across a highway, can bring traffic to a standstill, until it is removed and the highway is reopened. Snow drifts can quickly block roads and lanes, stranding motorists in their vehicles, and cutting off villages and farms from essential supplies and emergency aid.
NH1
It is called a roadblock.
The Eyre Highway crosses the Nullarbor Plain.
It varies between states, and whatever the DOT of that state determines is a safe speed. You get out to the Dakotas, they'll probably allow 65 once the crossover is made, whereas a state like Indiana would probably reduce your speed to 40 or 50.
It is a highway that goes right across Canada from Victoria, BC, to St. John's Newfoundland
A highway is used for a large number of cars, buses and trucks to get across countries in the shortest time
It goes clear across the state. It is the northern most Montana highway.