The document discusses transportation in the 1930s-1940s and 1970s, including cars, trains, bikes, and high speed trains. In the 1930s, there were only around 700 cars on UK roads, diesel trains were invented, and the speed limit was however fast you wanted to drive. By the 1970s, there were over 1,000 cars on UK roads, parking meters and speed cameras had been invented, and 50% of people were too poor to own bikes. High speed train services were also introduced as the best way to travel.