Typically, no. There may be cases where an exception is granted by permit, and these will usually require that vehicle to be escorted by road legal vehicles.
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The lightest (and smallest) street legal vehicle produced in America is the Myers Motors NmG. It is a three wheeled electric powered vehicle, which is currently produced in Tallmadge Ohio. In 1999 it was tested and received DOT approval for highway travel.
Any public road that is not an Interstate highway or that is not access on federal land.
Yes, as of 2005, Colorado does have open container laws. No open container is allowed anywhere in the passenger compartment of a passenger vehicle while on a public highway. There are exceptions such as limos, etc. It's a Class A offense that carries a $50 fine.
There are specific regulations that must be met in order for a vehicle to be "street legal". It's unlikely, but not impossible, that a go-kart could meet these. If it does not have a state-issued vehicle license, then no, it's not legal.
No, a certificate of title and vehicle registration are not the same. A certificate of title proves ownership of a vehicle, while registration is a legal requirement to drive the vehicle on public roads.
It depends on the state and the type of bike.
On an open highway with no intersecting roadways, it is very illegal. You will cause an accident if the other vehicle decides to turn to the left at an intersection.
No, it is not legal.
It depends. If the lack of a defroster will make the vehicle unsafe, it puts the bus out of service.
No, it is not legal to exceed the speed limit on a highway under any circumstances.
New York State allows studded snows from October 16 to April 30. NYS Vehicle & Traffic Law §375 (35a): "... no vehicle equipped with such [studded] tires ... may operate on a public highway during the period from the first day of May to the fifteenth day of October, inclusive."