In his new book, “Traffic: Why We Drive The Way We Do” author Tom Vanderbilt spent years researching the driving habits of motorists and arrives at some surprising conclusions. Studies show that using both lanes as long as possible makes merging traffic move faster. While women have more accidents than men, accidents involving men are more often fatal. Cruising for a real close parking spot at the shopping center usually takes more time than taking the first available spot (albeit farther way) and walking. If you idling for more than 6 seconds, you are wasting gas and should turn off the engine.