In one of my more recent posts, I enquired about forming fused/free relative clauses with 'what' and 'who' (relative pronouns). According to the answers I received, 'who' wouldn't normally occur in such constructions, but 'what' on the other hand can be readily used.
Typing in with that, I would like to seek how this would apply to relative adverbs, in particular 'where'. Below is a hypothetical conversation I came up with:
Driver: I think we are approaching a severe traffic jam.
Passanger: Then how about you let me get off (at?) WHERE you will be forced to stop. I rather walk to work than arrive late.
Basically, I am interested in knowing whether it is grammatically sound/natural to use 'where' in the context above to convey that I wanted to be dropped off at the particular position at which the driver will be caught in traffic." Also, is the use of 'at' before 'where' correct?
Furthermore, does the same apply to 'when'? Is it appropriate or not to use 'when' as a relative adverb in a fused relative clause?
Many thanks in advance.