For a design speed of 40 kmph the recommended value of weaving length is
- A30 to 60 m
- B45 to 90 mCorrect
- C90 to 120 m
- DNone of the above
Solution
Concept
Recommended weaving length in rotary design
Formula
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Step-by-step solution
1. Weaving length at rotary intersections depends on the design speed of the intersecting roadways. 2. According to standard Indian Roads Congress guidelines, for a design speed of 40 kmph, the recommended weaving length is 45 to 90 m. 3. Therefore, option B provides the correct recommended range. Answer: B
Explanation
Indian Road Congress guidelines specify recommended weaving lengths for traffic rotaries based on vehicle design speeds. For a design speed of 40 kmph, the minimum required weaving length is 45 meters, while the maximum recommended length is 90 meters. Therefore, 45 to 90 m is the correct recommended range.
Why the other options are wrong
A) 30 to 60 m is insufficient length for safe vehicle weaving at a design speed of 40 kmph. C) 90 to 120 m is recommended for higher design speeds such as 60 kmph. D) Option B is the correct answer.
Shortcut
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Common mistake
Confusing the weaving length range for 40 kmph (45-90 m) with the range recommended for 30 kmph (30-60 m).
Correct answer: B) 45 to 90 m