Remove the commas, and it reads the way it used to:I've always preferred "that" over "which", though I don't know which is grammar.
"other than an intersection which is controlled by a traffic control signal system." Meaning if there are lights, it is permissible. One would still be required by other clauses to look, stop, signal if crossing left, then proceed across when the way is clear.
[No person shall ride or operate a bicycle across a roadway within a crosswalk at an intersection or at a location other than an intersection which is controlled by a traffic control signal system.]
If that came before a Justice or Magistrate, he'd have to rule in your favour, and probably lambaste the Ministry while doing it for inserting commas that completely change the intention of the phrase.