How to calculate the width of urban roads and highways? I often see that * * road is 80 meters wide and 8 lanes in two directions, or * * road is 12 meters wide and 4 lanes in two directions. I don't understand it. The first road with 80 meters wide can't get 80 meters when I look left and right, and the visual inspection is 30-40 meters at most (although it's not accurate, but it's not much different. For example, the 50 meter long runway and the 80 meter wide road obviously show that the runway is longer at a glance). Another example is the 8.5 meter wide road, where three people hold hands and are wider than the road, Three people add up to no more than six meters Please give an example. It's better to have a schematic diagram,

How to calculate the width of urban roads and highways? I often see that * * road is 80 meters wide and 8 lanes in two directions, or * * road is 12 meters wide and 4 lanes in two directions. I don't understand it. The first road with 80 meters wide can't get 80 meters when I look left and right, and the visual inspection is 30-40 meters at most (although it's not accurate, but it's not much different. For example, the 50 meter long runway and the 80 meter wide road obviously show that the runway is longer at a glance). Another example is the 8.5 meter wide road, where three people hold hands and are wider than the road, Three people add up to no more than six meters Please give an example. It's better to have a schematic diagram,

The width of the road is not equal to the width of the road. The width of the road should be added to the median motor vehicle lane and the non motor vehicle lane on both sides. There are also ancillary facilities on both sides of the non motor vehicle lane, such as the curb. What you estimate is basically the width of the road. If a road with a width of 80m is regarded as the width of the road, what kind of vehicle needs a 10m wide lane