I think the destination has been more definitive than the season to change the number. 167 has two different routes : The metro/Casino shuttle and the Île Notre-Dame/Île Saint-Hélène circuit, from the Beach to La Ronde via metro. But I agree, a 700-serie for touristic routes is indeed a good idea.
You really think it's about mental disorder?..
How about having some free numbers for a network expansion? How about having a consistent, easy-to-use/easy-to-understand network, instead of patching holes when introducing a new line?
Sure, the first few weeks will be confusing for used customers. But cleaning up the numbering that took place in the early XXth century is worth it.
Québec City experience was cited as an example of success in the presentation of the project ; RTC has 54 eXpress/limited stops routes (numbered 100-399 and 800-804, 54 is more than twice of what STM currently operates in M-Bus/R-Bus/E-bus/T-bus routes), but still has plenty of free numbers in the 1-99 regular routes number bank. Renumberings took place twice in the CTCUQ/STCUQ/RTC history (1970, 1992) and no one got killed, injured nor developped schizophrenia. RTC even had some 400's-numbered express for Jeux Mondiaux des Policiers et Pompiers (2005), 500's-numbered express for linking shopping centres (prior to IKEA closure?) and 600's-numbered express (Express Nordiques) in the late 80's/early 90's on game nights.
I totally agree. I would have liked to see
400's numbered for suburban express service (E-bus), with no-stops sections : Keep 410/489, 420/405, 430/486, 470, even 480/412, 421 or 468. Add 77 (444), 143 (440), 148 (448), 159 (469), 173 (496), 182 (486), 184 (487), 190 (491), 194 (449 rush hour service), 199 (432 rush hour service) and 221 (411).
500's numbered for urban rapid transit service (R-bus), with limited stops and/or operation on a reserved lane : Keep 505, 506, 535. Add 120 (495/595), 460/500,502, 592 or 593, 467/567, 194 (449/549 daytime service) and 199 (432/532 daytime service).
600's numbered for Trainbus services (-bus). Keep 261 (601), 265 (607), 268 (668). That also leaves place for potential Train de l'Est trainbus routes.
700's numbered for touristic services (?-bus). Keep 747, 515 (715), 167 (767/777) and 169 (769).
800's numbered for temporary emergency metro routing (M-bus). 801, 802, 804 and 805.