got one wheel on the road

[lewsk]

Jerome parks his Wrangler with the nose almost touching the closed gate at 729 Lilac Drive, gets out, and pushes the call button.He has a reason to be here if someone from the Sugar Heights security patrol should stop and query him, but it will only work if the woman inside confirms him, and he’s not sure he can count on that.His earlier conversation with the lady has suggested that she’s got one wheel on the road at most.
-- what does "got one wheel on the road" mean?
Thanks

 

[Moderator]

It means that she only has 1 of 4 metaphorical "wheels" on the road, i.e. she's not completely mentally competent.

 

[GNTLGNT]

Jerome parks his Wrangler with the nose almost touching the closed gate at 729 Lilac Drive, gets out, and pushes the call button.He has a reason to be here if someone from the Sugar Heights security patrol should stop and query him, but it will only work if the woman inside confirms him, and he’s not sure he can count on that.His earlier conversation with the lady has suggested that she’s got one wheel on the road at most.
-- what does "got one wheel on the road" mean?
Thanks

...same thing as "a few fries short of Happy Meal".....well, that probably won't help either huh?.....