My Grandad had a friend in the travelling community who unfortunately found he was treated less seriously, often disrespectfully when he went to buy a bike (he had a soft spot for the same era of bikes as my Grandad). Grandad would take him to where a bike was for sale and park the car so his friend could see it without getting out. Grandad would bring the bike out so he could see it as well as inspect it, his friend would then give a hand signal either in favour of or against making the deal!