A priority intersection has a single-lane one-way traffic road crossing an undivided two-lane two-way traffic road. The traffic stream speed on the single-lane road is 20 kmph and the speed on the two-lane road is 50 kmph. The perception-reaction time is 2.5 s; coefficient of longitudinal friction is 0.38 and acceleration due to gravity is 9.81m/s2. A clear sight triangle has to be ensured at this intersection. The minimum lengths of the sides of the sight triangle along the two-lane and the single-lane road, respectively will be,

• A. 50 m and 20 m
• B. 61 m and 18 m
• C. 111 m and 15 m
• D. 122 m and 36 m