Let the hive mind of Engadget get that for you.
"We need a digital camera that can be switched on and fire off that first shot fast. It's not a commonly tracked statistic on any review site, and nobody seems to have this information for every camera. We were hoping other readers could inform us as to what small digital cameras can fire off their first pics in under a second (ideally under half a second). It needs to be small, but mostly, just really quick in operation. Thanks!"
There are lots of cases where that’s impossible, for example if you’re entering a roundabout from a standstill and taking the second exit. You’ll start the car moving in first and have to change into second while on the roundabout but will also have to signal to exit the roundabout.
Another situation is on some tree lined winding country lanes where you can’t see far ahead. Turns can sometimes initially start off shallow but out of view it turns very tight and you have to change gear while on the turn. Yes, ideally you’d be in the right gear before the turn but it’s often not possible.
"There are lots of cases where that’s impossible, for example if you’re entering a roundabout" -- then you should move. Roundabouts (aka traffic circles in Washington, DC, or rotaries in the Boston area) are an abomination; they make it much harder to drive safely. I can understand why they made sense in the days of horsedrawn carriages, but, in the 21st century, they should all be torn down and replaced with ordinary intersections.
Back on topic: I'd love to see one of these used for a prank. Put it in someone's car (ideally in the rear outlet, if there is one) and switch it to the wrong side for the country you're in.
Come to that, if I found myself riding in a car with one of these, the temptation to flip the switch would be pretty strong. :-)