Most cars already have start / stop technology fitted, and is to do with emissions reduction for the current emissions drive cycle test (NEDC), which contains a lot of 'stop' time. The new cycle, due for introduction in 2018 (?) contains far less stop time which will mean manufacturers will re-evaluate if the cost of start / stop systems is the best way to reduce emissions....it's possible the technology may be removed from cars in the coming years.
Commercial vehicles (buses, for example), are also subject to emissions requirements, but are measured very differently. Start / Stop technology is likely a way to meet these requirements, too. The latest emissions requirements had to be met in 2013, so best guess is that any bus produced 2013 or after will stop the engine every time the bus stops (subject to available battery power to start the engine etc).
Just a note that my car does this everytime I stop, and slip into neutral; it's called auto stop/start. To continue my journey, I dip the clutch, and engine re-starts. I thought most newish vehicles had this (if we're talking about the same type of technology), so having it on a bus doesn't surprise me.
New buses that my company have are hybrid engines which switches from the normal engine into the electric one which saves fuel and creates less pollution when stationary, then the driver to start moving presses the accelerator and the engines switch back again.
It does come as a surprise especially when driving one,trying to restart an engine when it is already on is funny to some passengers but not so to a redfaced driver.
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