1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
ME SEMESTER- III EXAMINATION SUMMER 2017
Subject Code: 2731306 Date 02/05/2017
Subject Name: Traffic Flow Theory and Simulation
Time: 02:30 pm to 05:00 pm Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

What do you mean by Macroscopic models? Explain various Macroscopic models with neat sketches.
07

Explain the field procedure of measuring time headway.
07
Q.2

Write a short note on "Poisson Distribution of vehicle arrival"
07

Define: Basic capacity, Possible capacity, Practical capacity, Level of Service, Uninterrupted traffic flow.
07
OR

Write a short note on "Acceleration Noise.
07
Q.3

For the following data on speed and density, determine the parameters of the Greenshield's Model. Also find the maximum flow and density correspondence to speed of 30Km/hour. K (as V (as
171
5
129
15
20
40
70
25
07

An observation on an Expressway yielded a count of 300 vehicles in a period of half an hour. Calculate the number of headways in this count.
Greater than 4 sec
Less than 15 sec
07
OR
Q.3

The traffic flow on a highway is q1= 2000 veh/hr with speed of v1=80 km/hr. As a result of an accident, the road is blocked. The density in the queue is k2 275 veh/km and jam density. Consider vehicle length 3.63 m.
Calculate
What is the wave speed
What is the rate at which the queue grows, in units of vehicles per hour
07

Explain the factors affecting Capacity and LoS.
07
Q.4

Derive the equation of Moving observer method.
07

What are the basic traffic flow parameters? Explain the relationship between basic flow parameters with neat sketch.
07
OR
Q.4

The headway observed are as under
07
2
0.8, 2.2, 2.8, 3.9, 1.6, 1.2, 3.5, 1.8, 1.4, 1.4, 2.8, 2.6, 2.9, 4.9, 1.8, 1.7, 5.9, 6.8, 2.3, 3.5, 0.9, 6.2, 0.8, 1.8, 1.4. What is the probability that headways are greater than 5 seconds?

Explain deterministic and stochastic queuing models
07
Q.5

A self service store employs one cashier at its counter. Nine customers arrive on an average every 5 minutes while the cashier can serve 10 customers in 5 minutes. Assuming Poisson distribution for arrival rate and exponential distribution for service rate. Find
Average number of customers in the system
Average number of customers in queue or average queue length
Average time a customer spends in the system
Average time a customer waits before being served
07

What do you understand by Shock wave? Explain with sketch
07
OR
Q.5

Write down the steps for simulation
07

Explain gap acceptance
07