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.
The distance depends on the laws in your jurisdiction. In  Massachusetts for example, you must follow no closer than 300  behind from an emergency vehicle responding to an aâ¦larm. In New  York the distance is 200 feet. In some states that distance is as  much as 500 feet. You need to check the law in your state.