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 minimum clear width should be 600 mm for occasional one-way traffic, 800 mm for regular one-. way traffic and occasional two-way traffic and 1000 mm for regular two-way traffic. 5.2.3 Pitch (straight stairs) The minimum pitch for straight stairs should be 30Â°.