In 2004, women's life expectancy exceeded men's life expectancy by 5.2 years, the smallest gender gap in life expectancy since 1946. Life expectancy for whites was five years greater than that of blacks. Life expectancy for black and white men and women was as follows: 1  Black male: 69.8 years.  White male: 75.7 years.
But, that's not always the case. Safe following distances vary according to traffic speed and weather conditions and according to the type of vehicle you're driving. In good conditions, you should allow 2 seconds between your car and the vehicle in front of you. Here's an easy way to work that out.
In most cases, a safe following distance is much longer than a car length. You should drive at least 2 seconds behind the vehicle in front during ideal conditions. Add 1 second extra for each 3m of trailer lengthâwhen driving a vehicle towing a trailer or caravan. Remember to also: 1  double your following distance in poor conditions.  increase following distances if you're driving a heavy vehicle.