You have improved well the track. Congratulations! :-)
Just three points :
1) Could you add sign just before pitstop? Because we arrive very fast on this part of the track, so we need information to brake early not to miss it
2) Could you add corner sign just after the dam pass? The right corner is a very difficult turn and can ruin your race
3) Optionaly, could add some variety to the texture of the road? For example used tarmac ;-)