France '40 4.00 Map Errors

[Strela]

I have a (probably) silly question. Are all roads going through a stream supposed to have a bridge?

In the absence of a bridge, a unit in travel mode trying to cross a stream via a road must spend the stream hexside cost + the road cost. It's costly, but doable for most units... so I wonder why a bridge-less crossing is considered to be a map error?

I can’t comment on the France ‘40 map, but it is intentional in many cases not to have many bridged streams in the Eastern Front maps.