Hazel

Hello, Hope you can help. We are building a new fire escape route in a strip of land, down the side of a car park, that will exit out into a public park. This will effectively be a fenced corridor that will lead to the park. How wide does that passage have to be? Are there any requirements for the flooring... can it be gravelled or does it have to be concreted/paved? Are there any requirements for the exit gate into the park? Width? Can it be a wooden gate? Does there have to be any specific handle/opening mechanism? Best wishes Hazel.