OTTAWA - When Prime Minister Justin Trudeau stepped in front of cameras last week to declare that barricades on rail lines and other major transportation routes had to come down, the move had been decided almost two days before.He intended to send a signal to the police that attempts to negotiate an end to the national crisis were not working and the situation was now in their hands, according to two sources with knowledge of the matter.Trudeau had been urging patience in the hopes of seeing the rising crisis end through negotiation, but a final 36-hour clock had run out.