Test: Traffic Engineering- 2 - Civil Engineering (CE) MCQ

At u = 0, 
k = k_max
u = u_max k → 0
The curve (a) satisfies these conditions.
Curve (c) represents relation between density and volume of traffic.

Comprehensive analysis of traffic and transportation data require:
- Origin and destination in each zone
- Mode of transportation
- Number of vehicle and passengers in each vehicle
- Purpose of each trip
- Selection of route
- Length of trip
- Intermediate stops and their reason etc.
All this can be collected by Road side interview method.

Effective green time = Actual green time + Yellow time - lost time
= 25 + 3 - 3 
= 25 seconds

Average running time = Average journey time - Average stopped delay
= 7.55 - 1.8 
= 5.75 minutes
Average running speed = 

Maximum number of vehicles per hour = 

At zero speed density is maximum and volume is zero.

Optimum cycle time,

L = Total lost time per cycle = 16 sec 
Y = y₁ + y₂

∴ 

An uncontrolled intersection is a junction where there are no traffic signals or signs to guide the drivers. In this case, we have two roads with two-lane, two-way traffic crossing each other. To determine the total number of potential major conflict points, we need to identify all the possible ways that vehicles coming from different directions can collide with each other.

Imagine standing at the center of the intersection. There are 4 approaches (North, South, East, and West), each with 2 lanes (one for each direction). When vehicles from these approaches enter the intersection, they can conflict with vehicles coming from the other 3 approaches.

For each approach, there are 4 possible left-turn conflicts, 4 right-turn conflicts, and 4 crossing conflicts. Let's break them down:

1. Left-turn conflicts: A vehicle turning left will need to yield to oncoming traffic and possibly conflict with vehicles coming from the opposite direction (4 possibilities), as well as vehicles coming from the left and right (4 possibilities). This gives us a total of 4 left-turn conflicts.

2. Right-turn conflicts: A vehicle turning right will need to watch out for traffic coming from the left (4 possibilities). This gives us a total of 4 right-turn conflicts.

3. Crossing conflicts: A vehicle going straight will need to be cautious of vehicles coming from the opposite direction (4 possibilities), as well as vehicles coming from the left and right (4 possibilities). This gives us a total of 4 crossing conflicts.

Now, to find the total number of potential major conflict points, we simply add these numbers together for each approach:

4 left-turn conflicts + 4 right-turn conflicts + 4 crossing conflicts = 12 major conflict points per approach

Since there are 4 approaches in total, we multiply this by 4:

12 major conflict points per approach x 4 approaches = 48 major conflict points

However, we have counted some conflicts twice (e.g., a left-turn conflict with a vehicle from the opposite direction is the same as that vehicle's crossing conflict). To account for this, we need to divide the total number of conflicts by 2:

48 major conflict points / 2 = 24 major conflict points

Finally, we need to subtract the 8 minor conflict points (4 left-turn conflicts and 4 right-turn conflicts) that are not considered major:

24 major conflict points - 8 minor conflict points = 16 potential major conflict points

So, there are a total of 16 potential major conflict points at an uncontrolled intersection where two roads with two-lane, two-way traffic cross.

Flexible progressive system (most efficient method of signalling).