Haunted mansion moving belt can be slowed to half the speed or completely stopped. Personally..I have had a lot of difficulty with communicating with the cast member even while trying different methods to say the belt needed to be slowed down.
Ex. 1st try...went with everyone else down the hall and tried to tell the person on the belt to slow it down by shouting and pointing to the belt. People behind me got angry with the hold up and CM didn't seem to understand which led to getting pushed out on the belt at regular speed and me stumbling and nearly falling into a buggy.
Ex. 2nd try...had GAC told CMs outside, inside, and at the ride entrance I needed it slowed down. Held up GAC so it could be seen and the belt was slowed down when I got on..however..the buggy I got in wasn't marked and when I got out at end of ride the belt was full speed and nearly fell but caught by family member.
One day I wasn't doing well and had to go in the wheechair...took alternate entrance and the ride was successfully stopped in the beginning and end.
In conclusion....well...make your needs known and do what works best for you... Remind CMs , don't be afraid to get a GAC if you need it, and most of all have a good time!
P.s. if you had a GAC before..and it has expired..just take it back in if your needs have not changed. A CM told me this one time. this way you don't get the third degree of why you need it as they already know that it has been determined you do need these accommodations. Also it is faster for them..they just copy the paper to a new one and if you ask they might be able to give you a 2 month pass instead of one day if your trip is more than one day!