Quote:
Originally Posted by NuclearPizzaMan
The way I read it, an increase of 20% is the target goal, not the maximum impact.
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They're indicating that 20% is a benchmark to be measured against and a reasonable expectation of travel time delay for motorists. It's an order of magnitude. That is to say, if it's 50% slower, that's unexpected. The "goal" is to minimize delay to the greatest extent possible.