"Urban development and transportation first", Chengdu started the expressway construction project of the second ring road viaduct in the central city this year, which will be completed soon.

Solution: (1) Let the resolution function be V=kx+b,

Then,

Solution:

So the functional expression of V about X is: V =-X+94;

(2) From the meaning of the question, v =-x+94 ≥ 50,

Solution: x≤88,

p = VX =(-x+94)x =-x ^ 2+94x

When 0 < x ≤ 88, the function is increasing function, that is, when x=88, p takes the maximum value.

Therefore, pmax = ~× 88 2+94× 88 = 4400.

A: When the traffic density reaches 88 vehicles /km, the traffic flow P reaches the maximum, with a maximum of 4,400 vehicles/hour.