The Germans had traffic jams in 1940 too. The road net in the Ardennes just wasn’t sufficient to support a major offensive. I don’t think you can make the traffic go away in the Ardennes any more than you can in Chicago or LA.
Hammering the rail junctions from the air didn’t help either. This was a huge help for the allies. It’s also a sign of just how quickly the Americans, particularly Eisenhower, realized the significance of the German attack that the strategic air force was immediately committed to bombing the rail hubs.
Exactly right but what the Germans did not in 1940 have was a bunch of French poli shooting at them and French and British aircraft bombing the supply lines.
The Luftwaffe pretty much took care of the aircraft part and the abysmal French generalship took care of the rest.
Regards
alfa6 ;>}