麻豆约拍

Grant Stott takes a look at the invention of tarmac. Roads used to be made from clay, earth or chalk, but these materials were very messy. John McAdam thought it would be easier if the roads were covered in small stones and invented tarmac. It took his company 30 years to cover all roads across the UK. The process involved spreading hot tarmac onto a road, adding lime chippings, and finally flattening the surface with a steam roller.

Please note this clip ends a little abruptly.