Cars and traffic are one of the important sources of CO2 emissions. It makes it then an interesting target for doing some DIY climate manipulation. There’s some effort of course to change the colour of the car but one can try also different kinds of covers. They can be the usual reflective one which are used in cold climates to make the snow&frost removal easier. In warmer climates, they are used to keep the cars cooler when parked. These kind of covers are handy because it’s possible to decide when to use them and also have an affect on the cooling/warming when it’s needed in order to lessen the gasoline use of air condition. The roads and parking spaces have a low albedo due to asphalt. When a car is lighter, it increases their albedo value for more reflectance.