According to the current version of car.lua, WayHandlers.maxspeed is called after WayHandlers.speed in:

which overwrites the speeds with the maximum speed values.

It seems more reasonable that, if we specify a default speed per road in:

Then we only use (max speed *0.8) if result.forward_speed or result.backward_speed don’t have a value assigned still.

And finally, only assign the default speed if the parse_maxspeed function returns 0.

This could be done by assigning result.forward_speed = -1 instead of profile.default_speed

and then in WayHandlers.maxspeed function we can assign result.forward_speed = forward * profile.speed_reduction only if result.forward_speed == -1.

Looking forward to having your input on this. Thanks in advance.