The machines are relatively cheap in the us you can pick up a decent brand new quad for less than $5000 - , you are not required to where helmets on roads or trails with any machine but it is highly recommended.

Harley Davidson's are very popular in the states and they regularly have meets, the driving style in America is so much more relaxed and not rushed like the uk roads. England has a lot more Japanese bikes pocket rockets which are not as popular here due to the different driving.

Bicycles are not as popular in America as they are in Britain mainly because you have to travel pretty far to get anywhere

Japanese bikes are very popular in the UK most probably due to the speed and maneuverability, A lot of people drive mopeds scooters due to how economical they are but this has developed youths making scooter posies with under moped neon's and go faster stickers.

Mini motos are fast growing in the uk there are no tracks round that I know of but people mostly ride them around car parks and fields, dirt bikes are growing popular as well there is a track that has been built next to the M25 motorway it is not meant to be used as a track but people are doing.

A lot of people ride bikes in uk as they are good for fitness and the environment there are sections for cyclists on most roads to make it safe.