Crowd control and the movement of people can be controlled with different textured slabs so they can feel their way around but it can also be done with obstacles like walls. Every wall needs a hole or a door or an entrance but controlling the flow can be important.

Over the last few months I have seen various human control styles (get it?!) and techniques. They vary with simplicity of use and understanding but all succrssfully slow you down, if you had a bike or a pram I am sure they would prove awkward but passable.