Capacity is the maximum number of vehicles that can pass through a given point on a highway in one hour under ideal conditions.

The six levels of service (LOS) used to describe the quality of traffic flow on a highway are A, B, C, D, E, and F.

The LOS for a highway with a volume of 1,500 vehicles per hour and a capacity of 2,000 vehicles per hour is C.

All of the factors listed affect the capacity of a highway.

All of the measures listed can be taken to improve the LOS of a highway.

Capacity is inversely proportional to LOS, meaning that as capacity decreases, LOS decreases.

The formula for calculating the capacity of a highway is $$C = k * v * f_e$$, where C is capacity, k is a constant, v is the speed of traffic, and $$f_e$$ is the effective lane width.

The formula for calculating the LOS of a highway is $$LOS = rac{v}{C}$$, where LOS is the level of service, v is the speed of traffic, and C is the capacity.

The typical capacity of a two-lane highway in rural areas is 2,000 vehicles per hour.

The typical capacity of a four-lane highway in urban areas is 8,000 vehicles per hour.

The typical LOS for a highway with a volume of 1,200 vehicles per hour and a capacity of 1,500 vehicles per hour is B.

The typical LOS for a highway with a volume of 2,000 vehicles per hour and a capacity of 2,500 vehicles per hour is C.

The typical LOS for a highway with a volume of 3,000 vehicles per hour and a capacity of 3,500 vehicles per hour is D.

The typical LOS for a highway with a volume of 4,000 vehicles per hour and a capacity of 4,500 vehicles per hour is E.

The typical LOS for a highway with a volume of 5,000 vehicles per hour and a capacity of 5,500 vehicles per hour is F.