Dont have my copy of the latest ICAO ATM manual avail, but it says quite cleary there that you may not cross a stop bar under any circumstances, unless the ATC says there is a fault with it and you may disregard it. In all other circumstances, pilots must obey the stop bars and request further insructions.
Where the stop bar is faulty, there should be a vehicle avail to assist you to cross it, as well