I spend far too much driving, and therefore have plenty of time to think deeply and philosophically about possible improvements to the road system, cars in general, etc. I've listed some of my better ideas below, please note that patents are pending on all of them.

If only...

1. there was some way of making cars visible in poor weather and light conditions? Especially gray and black cars. After much thought, I have come up with the idea of fixing illumination devices to the outside of the vehicles. Perhaps different coloured lights at the front and back of the vehicle? For convenience, these could perhaps be operated by a switch inside the vehicle, so that the motorist does not have to stop the car, and light all of the devices individually.
2. there was a way that drivers could let other drivers know what they were about to do? Especially drivers in the East Midlands, and lorry drivers from Poland. My radical suggestion is that eye-catching flashing lights could be attached to the outside of the vehicle, and these could be operated using a a switch or lever inside the vehicle prior to a manoeuvre being performed? These lights should be a different colour to those discussed in idea 1 - orange might be an option?
3. there was some information that drivers could use to know where they should position their vehicle on the road? Especially drivers who use the A52 in the Nottingham area. I suggest that marking of some sort could be applied to the road surface which would indicate the best place to position a vehicle. These markings could be painted on the road using a highly visible paint, perhaps white and reflective?
4. there was some place on or near a road that drivers could stop their car so that it did not block all traffic behind it? Especially on narrow roads, or at the entrance/exit to university campuses, etc. I propose using a similar method to that outlined in idea 3, in which vehicles could be temporarily placed in designated areas which would be indicated by highly visible markings. These areas could perhaps be called parking spaces, and each one would be of suitable size for a single vehicle to be parked and would have enough space so that the vehicle doors could be opened to allow egress of the passengers?
5. there was some way of ordering road traffic so that faster vehicles could pass slower ones? Especially on the Clifton Boulevard in Nottingham. Perhaps slower vehicles could use a particular side of the road? This would tie in with idea 3 - the slower vehicles could use, say, the left lane, whereas faster ones could use the right? This idea may be a non-starter as it would require the difficult manoeuvre of changing lanes, which I appreciate is beyond the capability of most motorists.
6. there was some part of the road where lorries could overtake each other? Especially tanker lorries on the A1. Perhaps a section of the road characterised by a negative (or downhill) gradient, rather than a positive (or uphill) gradient? Developing such a section of road would mean that the lorries would actually have enough speed both to pass each other, and not reduce the traffic behind them to 30-40 mph. From repeated observation of lorries, no stretches of road like this exist at present, and development of downhill parts of the road network may therefore prove overly expensive.
7. there was some method that would allow drivers to know at what speed they were travelling? Especially when using single-lane, no overtaking roads such as the A52. This would allow them to keep a constant speed, rather than varying from 30 to 60 mph for no good reason. Perhaps some sort of dial, suitably calibrated in miles per hour, upon which a needle would indicate the speed of the vehicle? The driver could refer to this and thus keep a constant velocity?

These ideas are all probably too radical and difficult to be adopted, but I put them forward as suggestions.