Escape velocity is the speed an object must reach to break the bonds of a planet’s gravitational force and get into orbit. To enter orbit around the Earth, for example, a spacecraft needs to be going at a staggering 7 miles per second (25,000 miles per hour). This creates a difficult series of connected problems. The vehicle requires a lot of fuel. Fuel adds weight. More weight means more thrust is required. Greater thrust demands more fuel. And so it goes on … Another situation where speed has a crucial effect on the outcome is in relation to pedestrian road traffic accidents. In this article, we will consider the significance of vehicle speed in pedestrian collisions. Secondly, we will consider the effect of some other factors apart from impact speed. Finally, we will look at some of the implications for measures which can be taken to improve road safety. Frontal impact collision research has considered the effect of speed. Research into road accidents involving Continue Reading