The width of the carriageway is 15 meters. The green traffic light is on for 20 seconds. With what is the slowest speed a pedestrian
| August 8, 2021 | education
The width of the carriageway is 15 meters. The green traffic light is on for 20 seconds. With what is the slowest speed a pedestrian can move from the moment the traffic light comes on.
Pedestrian path length = carriageway width = 15 m.
Time for a pedestrian to cross the carriageway maximum = 20 sec.
Pedestrian speed must be at least = 15/20 = 0.75 m / s
Considering that 20 sec = 1/3 minute = 1/180 hour, and 1 km = 1,000 m,
minimum pedestrian speed = 15 / (1/180) = 15 * 180 = 2,700 m / h = 2.7 km / h.
Answer: minimum pedestrian speed = 0.75 m / s = 2.7 km / h.
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