Aaah, one of my pet topics, and a very real problem for a lot of folks.
Fortunately Thai people are indeed very helpful, but much still needs to be done.
Those slopes installed in kerb edges are much too steep for a start.
Ongoing limitations with Skytrain access as well. OK - elevators are installed now, but how on earth do you find someone to help you access them without first going up the stairs?
We found ourselves faced with yet another flight of stairs at the Chatuchak BST last week. Strange as it seems people with knee problems often find that going down starcases is much more difficult than going up them. So there is an elevator conveniently placed at the head of the stairs to ground level. But it's secured by an extra glass door, which can't be opened from the outside!
Toilets of course are an extra problem in LOS, especially at service areas which still have squatties, and on trains. Take a look in SN Restaurant at the top of the HH Night Market for a classic loo access problem. Its in a tiny room with 3 steps ascending to the throne.
As for pavements - gimme a break. HH isn't as bad pavement wise as Bangkok though, where building work on Sukhumvit and in Siam Sq areas have resulted in some tortuous messes. Not to mention the Soi Yamato pavements in Pattaya where the smoking ban has forced bar stools outside, blocking pedestrian access.
Good to see though that more disabled Thai people seem equipped with decent crutches these days. I just wonder how many loose them down holes in the pavements.

A sprout is for life - not just for Christmas.