TE II 04/06/2025

TRAFFIC ENGINEERING II

BOOSTER

Multiple Choice

What does 'space headway' refer to in traffic flow?

• Time between vehicles
• Speed of vehicle
• Distance between vehicles
• None of the above

Explanation Slide...

Space headway is the distance between successive vehicles in the same lane measured from head to head.

Multiple Choice

Which relation is true regarding speed, flow, and density?

• Flow = Speed x Density
• Speed = Flow / Density
• Density = Flow / Speed
• All of the above

Explanation Slide...

The speed-flow-density relationship interlinks all three parameters as per fundamental traffic flow equations.

Multiple Choice

Which type of capacity assumes ideal conditions?

• Practical capacity
• Possible capacity
• Theoretical capacity
• Design capacity

Explanation Slide...

CAPACITYBasic Capacity / Theoretical Capacity (q c ): It is the maximum number of passenger cars that can pass a given point on a lane during one hour under ideal roadway conditionPossible Capacity : It is the maximum number of vehicles that can pass under normal roadway condition through a point during one hourPractical Capacity / Design Capacity : It is the maximum number of vehicles that can pass a point during one hour without high traffic density and unreasonable delays

Multiple Choice

Which signal type is controlled by traffic demand and sensors?

• Fixed time signal
• Manual signal
• Traffic actuated
• Simultaneous system

Explanation Slide...

Fixed-time signals: operate on pre-set timing cycles, regardless of traffic conditions. Traffic-actuated signals: adjust the timing of the light cycle based on the intensity of the traffic. Manually operated signals: are controlled by traffic police, allowing for adjustments to the timing of the lights based on real-time traffic conditions. 

Multiple Choice

Assertion (A): Rotary intersections are used when traffic volume is between 500 to 3000 vehicles/hr. Reason (R): Rotary intersections help manage high right-turn traffic up to 30%.

• Both A and R are true and R is the correct explanation
• Both A and R are true but R is not the correct explanation
• A is true, R is false
• A is false, R is true

Explanation Slide...

Traffic Rotary at road intersections is a special form of grade change of lanes to channelize the movement of vehicles in one direction around a central traffic island. Rotary intersections are ideal for high volume and high right-turn scenarios, typically between 500–3000 vph.

Multiple Choice

What is the shape and size of a 'STOP' sign?

• Circular, 600 mm
• Inverted triangle, 900 mm
• Octagonal, 900 mm
• Square, 900 mm

Explanation Slide...

The STOP sign is uniquely octagonal in shape and 900 mm in height for visibility and recognition.

Multiple Choice

Which of the following is NOT a type of traffic control signal system?

• Simultaneous system
• Progressive system
• Flexible progressive system
• Static linear system

Explanation Slide...

Static linear system is not a recognized traffic signal system. Others are real systems for signal coordination.Simple progressiveContinuous operation of group of vehicle along road at design speedGO GO systemEffective is speed and distance between intersections are sameSimultaneousAll signals on main road shows same signalAlternateAlternate signals shows opposite signal indicationFlexible progressivePossible to vary signal cycle with help of sensors – most efficient system for traffic of different volume & spacing

Multiple Choice

Statement 1: Informatory signs have blue background with white legend. Statement 2: Warning signs are circular in shape.

• Both statements are true
• Only Statement 1 is true
• Only Statement 2 is true
• Both statements are false

Explanation Slide...

All Mandatory or Regulatory Signs are circular in shape. Mandatory/Prohibitory Signs are to indicate the prohibition upon certain kind of vehicle maneuver and vehicle typeCautionary/Warning signs are triangular in shape with red border and black symbol in white background used to caution and alert the road users to potential danger or existence of certain hazardous conditions either on or adjacent to the roadwayInformatory Signs for facilities indicates location and direction to facilities like "fuel station" or "eating place" or "parking" and shall be a symbol within a rectangular board with blue background.

Multiple Choice

What is the purpose of road markings at bus stops and zebra crossings?

• To guide pedestrians
• To decorate the road
• To restrict parking
• To channelize traffic

Explanation Slide...

Markings at bus stops and zebra crossings help channelize and manage traffic flow efficiently.

Multiple Choice

Which sign shape is exclusively used for regulatory signs?

• Circle
• Triangle
• Rectangle
• Diamond

Explanation Slide...

Circular signs are used for regulatory purposes indicating rules such as speed limits, turns, etc.

Multiple Choice

Which of the following is not an objective of traffic signals?

• Reduce congestion
• Eliminate traffic
• Improve safety
• Control traffic flow

Explanation Slide...

Traffic signals aim to manage traffic, not eliminate it.

Multiple Choice

What is the effect of excessive signal cycle length?

• Reduced accidents
• Improved pedestrian movement
• Increased delay
• No effect

Explanation Slide...

Longer signal cycles can increase waiting time and delay for road users.

Multiple Choice

Assertion (A): Progressive signal systems improve vehicle movement on urban roads. Reason (R): They coordinate green signals based on vehicle arrival times.

• Both A and R are true and R is the correct explanation
• Both A and R are true but R is not the correct explanation
• A is true, R is false
• A is false, R is true

Explanation Slide...

Progressive systems coordinate green lights to maintain smooth traffic flow across intersections.

Multiple Choice

Statement 1: Synchronised signal systems help improve corridor flow. Statement 2: Traffic signals are not useful at isolated intersections.

• Both statements are true
• Only Statement 1 is true
• Only Statement 2 is true
• Both statements are false

Explanation Slide...

Statement 1 is true. Statement 2 is incorrect — signals are often essential at isolated intersections.

Multiple Choice

Which color is used for direction signs in India?

• Green
• Red
• Blue
• Yellow

Explanation Slide...

Direction signs in India use green background with white letters for guidance.

Multiple Choice

Which type of island is used to separate opposing flows of traffic?

• Channelizing island
• Divider island
• Rotary island
• Pedestrian island

Explanation Slide...

Divider islands are elongated raised structures used to separate traffic moving in opposite directions.

Multiple Choice

What is the typical width of a pedestrian crossing marking as per IRC standards?

• 300 mm
• 500 mm
• 600 mm
• 1000 mm

Explanation Slide...

Pedestrian crossing stripes are generally 600 mm wide according to Indian Roads Congress standards.

Multiple Choice

Which system adjusts signal timings to changing traffic patterns in real-time?

• Fixed-time system
• Vehicle actuated system
• Manual system
• Pedestrian-controlled system

Explanation Slide...

Vehicle actuated systems use sensors to detect traffic and adjust signal timings dynamically.

Multiple Choice

What is the full form of ADT in traffic engineering?

• Average Day Traffic
• Average Daily Transport
• Average Daily Traffic
• Annual Daily Traffic

Explanation Slide...

ADT stands for Average Daily Traffic, which represents the average number of vehicles passing a point daily.ADT=(Number of Vehicles in 7 days)/7Annual Average Daily Traffic (AADT)AADT=ADT ×DF×WF×SF

Multiple Choice

What is the primary function of lane markings on highways?

• To indicate speed limits

• To guide vehicle movement

• To enhance road aesthetics

• To provide information about exits

Explanation Slide...

ROAD MARKINGSMarkings like patterns (dividers, separators), words (STOP) and reflectorsExamples: Marking in bus stops, parking spaces, zebra crossing etc.