APSC AE WRD 2019 PYQ: Traffic Signal System

Traffic Signal System Multiple Choice Question

Question: The most efficient traffic signal system is:
(A) Simultaneous system
(B) Alternate system
(C) Flexible progressive system
(D) Simple progressive system

Answer: (C) Flexible progressive system

Explanation

A traffic signal system is designed to manage vehicle flow efficiently through intersections and road networks. The efficiency of a system depends on its ability to minimize delays, reduce stops, and adapt to varying traffic conditions.

Types of Traffic Signal Systems

System Type	Description	Efficiency
Simultaneous System	All signals turn green or red at the same time.	Low efficiency, causes delays and wasted green time. Rarely used.
Alternate System	Signals alternate between green and red in fixed succession.	Moderate efficiency, improves coordination but not responsive to real-time traffic.
Flexible Progressive System	Signals are dynamically coordinated based on real-time traffic flow, adjusting timing for traffic density and peak hours.	High efficiency, minimizes stops and delays, ideal for urban areas with variable traffic.
Simple Progressive System	Signals are timed for continuous traffic flow at a constant speed.	Good efficiency for uniform traffic but less adaptable to variable conditions.

Key Notes

• The flexible progressive system is the most efficient due to its ability to adapt signal timings to real-time traffic conditions, reducing congestion and delays.
• Simultaneous systems are outdated and inefficient, leading to significant delays in modern traffic scenarios.
• Simple progressive systems work well for roads with consistent traffic flow but lack the adaptability of flexible systems.
• Effective traffic signal systems are critical for urban planning and traffic management in civil engineering.

Note: The flexible progressive system optimizes traffic flow in dynamic urban environments, making it the preferred choice for modern traffic management in civil engineering projects.

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