harling wrote:On the highway, "In one mile..." means I have about a minute before my next maneuver. If I'm in the inside lane, I need to start heading to the outside. I do not need to slow down yet, and people behind me will be annoyed if I do.
"In a quarter mile..." means my next maneuver takes place about 15 seconds after the start of the announcement--and perhaps half that by the time the announcement is completed. If I'm not already in the correct lane, I need to get over now or I'm going to miss my turn, and it may already be too late to start slowing down, depending on the ramp.
By telling the driver that a turn is coming up, but not mentioning which of the above two scenarios applies until the very end of the announcement--by which point the remaining distance/time may have decreased considerably--there is a period of ambiguity during which the driver doesn't know if he has a leisurely minute in which to prepare, or is about to miss his turn entirely.cherieandchris wrote:There a distance counter on the screen as well. So if you can grab a glance you'll have a good idea, when to start turning, as you would have slowed down, sufficiently by then.
Having to read the remaining distance indicator, in order to decide whether you need to slow down immediately and/or make a mad dash for the outside lane, is not acceptable. The purpose of audible directions is to reduce your dependence on the screen, so you can keep your eyes on the road and drive more safely. Since spoken instructions are one-dimensional (i.e., they can only impart information in the order in which it is presented), that ordering is critical.
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