 Let's talk about speed. We all love fast things, fast food, fast internet, fast bowling, when it starts as an engine. But speed isn't always great. Let's have a look at what happens when you go just five kilometres an hour over the speed limit in the sixth design. There's two factors that we consider and how long it's going to take to stop when you see that other car pull out. That is the reaction distance and the braking distance. The car travelling at 60 kilometres an hour will manage to come to a complete stop in 45 metres. But if you're at 65 kilometres an hour you need to travel for an extra seven metres before you come to a stop and you will well and truly hit that car that's pulling out in front. You'll hit it hard. So if only five k's an hour over the limit causes this, why would we even speed at all?