You should have included the defining text:
170. (1) No person shall park, stand or stop a vehicle on a roadway,
(a) when it is practicable to park, stand or stop the vehicle off the roadway;
or
(b) when it is not practicable to park, stand or stop the vehicle off the roadway unless a clear view of the vehicle and of the roadway for at least 125 metres beyond the vehicle may be obtained from a distance of at least 125 metres from the vehicle in each direction upon the highway. R.S.O. 1990, c. H.8, s. 170 (1).
or
(b) when it is not practicable to park, stand or stop the vehicle off the roadway unless a clear view of the vehicle and of the roadway for at least 125 metres beyond the vehicle may be obtained from a distance of at least 125 metres from the vehicle in each direction upon the highway. R.S.O. 1990, c. H.8, s. 170 (1).