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 measured sight distance for this maneuver is 350 feet. The minimum recommended sight distance is 335 feet for 30 mph. This shows that there is adequate sight distance for a right-turn maneuver from the side road, 13th Street. Figure 4.11 shows the measurement that was conducted for a left-turn maneuver.