Hello,
I tested the latest develop build with Isle of man data. The way id 4003544 failed LUA parsing. I had to add a double attribute "speed" to ExtractionWay struct and the following change to "car.lua". last few lines in way_function.

if(way.speed and way.speed > 0) then
way.speed = way.speed * speed_reduction
if maxspeed_backward > 0 then
way.backward_speed = way.backward_speed*speed_reduction
end
end

cheers