Even out here in the countryside, the verges are littered with rubbish that's clearly been thrown from cars. The majority of it is empty beer cans, followed by fast-food packaging. It makes my blood boil!
When out cycling last year, I cycled past a trail of empty food packaging plus the carrier bag that they had come out of. Then I spotted what looked like a receipt a few yards further on. I stopped to look, and it was definitely the receipt for the now-discarded items (or rather their packaging). They had been paid for by card, so in theory it would have been perfectly possible for the culprit to be found, but can you imagine the reaction I would have got if I'd turned up at the police station suggesting that they follow up on it and prosecute that person? If only there was something that we could do!