Question 1 (8 points) Consider the following vehicle occupancies due to changes

Question

Question 1 (8 points) Consider the following vehicle occupancies due to changes in the downtown policy parking % of vehicle Average travel distance per vehicle (mile) 65 20 15 1500 2500 2000 2 26 19 Compute the percentage change in VMT, the percentage change in fuel consumption, and the percentage change in PMT? Assuming the number of people traveled are the same betore and after changes. Assume also the number of vehicles after changing in parking policy is 1000. The rate of fuel consumption is 14 miles per liter

Explanation / Answer

VMT for all the three occupancies can be calculated separately and then summed up to obtain VMT of the parking area.

We know that VMT = Amount of daily traffic on roadway segment*length of segment

Given no. of vehicles after changing in parking policy is 1000.

Hence 55+26+19 =100% = 1000 which means 1% = 10

Before change in parking policy

VMT1= 650*1500

VMT2 = 200*2500

VMT3= 150*2000

VMTparking area = VMT1+VMT2+VMT3 = 650*1500+200*2500+150*2000 = 1775000

After change in parking policy

VMT1 = 550*1500

VMT2 = 260*2500

VMT3 = 190*2000

VMTparking area = VMT1+VMT2+VMT3 = 550*1500+260*2500+190*2000 = 1855000

Percentage change in VMT = (1855000-1775000)*100/1775000 = 4.51%

Given the no. of people travelled are the same before and after changes = P

PMTinitial = P*l where l is the length of the parking area

PMTfinal = P*l

Hence% change in PMT is 0%.

Before change in parking policy

Distance travelled = 650*1500+200*2500+150*2000 = 1775000 miles

After change in parking policy

Distance travelled = 550*1500+260*2500+190*2000 = 1855000 miles

Given rate of fuel consumption is 14 miles/litre

Hence fuel consumed before change in parking policy = 1775000/14 = 126785.71 litres

Fuel consumed after change in parking policy = 1855000/14 = 132500 litres.

Percentage change in fuel consumption = (132500-126785.71)*100/126785.71 = 4.51%

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