
http://latimesblogs.latimes.com/technol ... ation.html
Moderators: MostMint, wxo, Fred32v, Basement Paul, ttamrettus
So which is it? Am I supposed to shut my engine off, or not? So now I'm supposed to think that IBM's smart traffic lights are now going to somehow stop/re-start my engine in a more efficient fashion? I get what they are saying, and have heard that the rule of thumb is that if the engine is going to be off for less than 60 seconds, it's more efficient to let it idle. But was that the case for carbs? efi? what about direct injection? But trying to put in place a large-scale system to try and optimize this is crazy. It will cause more problems than will be solved by any measurable fuel savings.Fuel may be wasted when drivers keep their vehicles running while waiting for the traffic signal to turn "green" or waiting for a train to pass at a railway crossing. Most drivers may not switch off their engines in these situations. Drivers who do switch off their engines may do so inefficiently. For example, a driver may switch off the engine, only to start it up a short time later. In such cases, more fuel may be consumed in restarting the engine.