about asphalt

Based on the production formula of real asphalt, we can consider adding the recipe "aggregate + fine sand + heavy oil → asphalt". This mixture can be produced at a concrete mixing plant and used for road paving to increase truck driving speed. In the game, players often struggle with the management of heavy oil. Burning it directly causes pollution, and converting it into hydrogen consumes additional production capacity. By utilizing this method, we hope to effectively utilize heavy oil without causing unnecessary waste or pollution.

I figure we can use a Mixer/Mixer II for it, and just add a new Asphalt surface, maybe it increases speed or lowers maintenance a little more than the 20% usually. It'd also help use up some of that extra rock we've all got lying around always.
I'd basically mirror Concrete.
4x Heavy Oil
4x Sand
12x Gravel
4x Heavy Oil
4x Sand
12x Slag Crushed
4x Heavy Oil
4x Manufactured Sand
12x Gravel
4x Heavy Oil
4x Manufactured Sand
12x Slag Crushed

I'd just be happy with asphalt being a different skin for the concrete surfaces