Told ops last week that with only 15 mins to spare at the end of our split duty we were going to overrun FTLs if we operated in the fog, because there would doubtless be fog. They said that maybe the weather would clear up and we should try anyway. What do ops know about weather forecasting? Due to tech problems and fog on both sectors we ended up being late and had much reduced rest. This is a regularly rostered trip and with that night's problems the captain offered them the option of making it a full night stop instead of a split. They say they have never had problems before, but I wonder how many of my colleagues when faced with a commute home in rush hour after a 14hr overnight split duty with only 4hrs rest in a room next to the lift feel like going up to ops to tell them.