A two lane, one-way road with radius of $50 \mathrm{~m}$ is predominantly carrying lorries with wheelbase of $5 \mathrm{~m}$. The speed of lorries is restricted to be between $60 \mathrm{kmph}$ and $80 \mathrm{kmph}$. The mechanical widening and psychological widening required at $60 \mathrm{kmph}$ are designated as $w_{m e, 60}$ and $w_{p s, 60},$ respectively. The mechanical widening and psychological widening required at $80 \mathrm{kmph}$ are designated as $w_{m e, 80}$ and $w_{p s, 80},$ respectively. The correct values of $w_{m e, 60}, w_{p s, 60}, w_{m e, 80},$ $w_{p s, 80},$ respectively are

(A) $0.89 \mathrm{~m}, 0.50 \mathrm{~m}, 1.19 \mathrm{~m},$ and $0.50 \mathrm{~m}$

(B) $0.50 \mathrm{~m}, 0.89 \mathrm{~m}, 0.50 \mathrm{~m},$ and $1.19 \mathrm{~m}$

(C) $0.50 \mathrm{~m}, 1.19 \mathrm{~m}, 0.50 \mathrm{~m},$ and $0.89 \mathrm{~m}$

(D) $1.19 \mathrm{~m}, 0.50 \mathrm{~m}, 0.89 \mathrm{~m}$, and $0.50 \mathrm{~m}$

A two lane, one-way road with radius of $50 \mathrm{~m}$ is predominantly carrying lorries with wheelbase of $5 \mathrm{~m}$. The speed of lorries is restricted to be between $60 \mathrm{kmph}$ and $80 \mathrm{kmph}$. The mechanical widening and psychological widening required at $60 \mathrm{kmph}$ are designated as $w_{m e, 60}$ and $w_{p s, 60},$ respectively. The mechanical widening and psychological widening required at $80 \mathrm{kmph}$ are designated as $w_{m e, 80}$ and $w_{p s, 80},$ respectively. The correct values of $w_{m e, 60}, w_{p s, 60}, w_{m e, 80},$ $w_{p s, 80},$ respectively are

(A) $0.89 \mathrm{~m}, 0.50 \mathrm{~m}, 1.19 \mathrm{~m},$ and $0.50 \mathrm{~m}$

(B) $0.50 \mathrm{~m}, 0.89 \mathrm{~m}, 0.50 \mathrm{~m},$ and $1.19 \mathrm{~m}$

(C) $0.50 \mathrm{~m}, 1.19 \mathrm{~m}, 0.50 \mathrm{~m},$ and $0.89 \mathrm{~m}$

(D) $1.19 \mathrm{~m}, 0.50 \mathrm{~m}, 0.89 \mathrm{~m}$, and $0.50 \mathrm{~m}$

1 Answer

5876 Votes

3537

$0.50 \mathrm{~m}, 0.89 \mathrm{~m}, 0.50 \mathrm{~m},$ and $1.19 \mathrm{~m}$

While traveling along and against the traffic stream, a moving observer measured the relative flows as 50 vehicles/hr and 200 vehicles/hr, respectively. The average speeds of the moving observer while traveling along and against the stream are $20 \mathrm{~km} / \mathrm{hr}$ and $30 \mathrm{~km} / \mathrm{hr},$ respectively. The density of the traffic stream (expressed in vehicles/km) is

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