QQuestionCivil Engineering
QuestionCivil Engineering
c) The dilemma zone may be eliminated by
(i) Select an appropriate minimum duration for the amber signal phase
(ii) minimizing stopping sight distance
(iii) Increasing the width of intersections
(iv) neglecting human factors
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Answer
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Step 1:Let me solve this problem step by step, focusing on the dilemma zone elimination strategies.
Step 2:: Understanding the Dilemma Zone
The dilemma zone is a critical traffic engineering concept where drivers face an uncertain decision at an intersection when the traffic signal changes from green to amber. Drivers must quickly decide whether to stop or proceed through the intersection.
Step 3:: Analyzing the Proposed Solutions
\text{Recommendation: } \times \text{ INCORRECT}
Let's evaluate each proposed method for eliminating the dilemma zone: (i) Select an appropriate minimum duration for the amber signal phase - Proper amber signal duration allows drivers sufficient time to safely clear or stop at the intersection - Calculated based on factors like: * Vehicle speed * Intersection width * Driver reaction time - Provides clear decision-making time for drivers (ii) Minimizing stopping sight distance - Stopping sight distance is about visibility, not directly related to dilemma zone elimination - Does not address the core decision-making challenge (iii) Increasing the width of intersections - Wider intersections do not solve the fundamental dilemma zone problem - May actually increase complexity and decision-making difficulty (iv) Neglecting human factors - Human factors are crucial in traffic safety - Ignoring human behavior would create more safety risks
Final Answer
The correct method to eliminate the dilemma zone is (i) selecting an appropriate minimum duration for the amber signal phase. This approach provides drivers with a clear, safe window to decide whether to stop or proceed through the intersection.
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