I appreciate your concern about this unsightly and environmentally damaging problem, so I am pleased to tell you that Ministers have published a National Litter Strategy, which aims to apply best practice in education, enforcement and infrastructure to deliver a substantial reduction in litter and associated behaviour. The aim is to bring about demonstrable improvements in the cleanliness of our country and a cultural shift to make littering socially unacceptable.
Actions include working with Highways England to target the 25 worst litter hotspots across our road network, aiming to bring about long-lasting improvements to the roads that are often the gateways to our towns and cities. In April 2018, the maximum fixed penalty for dropping litter anywhere almost doubled from £80 to £150, and councils have gained powers to impose civil penalties on the keepers of vehicles from which litter is thrown, even if it was discarded by someone else.
Highways England (under its former name, The Highways Agency) published its own litter strategy in April 2014. It subsequently updated the document in 2016. 
The body continues to work with relevant partners on litter issues, such as encouraging commercial drivers to ensure their vehicles do not spill litter or debris. It works closely with the Government and Keep Britain Tidy to raise public awareness of the dangers and costs of litter, also running campaigns to encourage motorists to take their litter home. Social media and roadside signs are used to remind drivers to dispose of their litter responsibly.