OASDI stands for old age, survivor and disability insurance, which is more commonly referred to as Social Security. To pay for these programs, the federal government imposes a tax on earned income that must be withheld by your employer.
According to the December 1985 issue of Popular Mechanics, the Protex Safety Signal Company introduced flashing turn signals in 1920. The first modern turn signal, though, can be attributed to Edgar A. Walz, Jr. who, in 1925, secured a patent for one and tried to market it to major car manufacturers. They just weren't interested, and the patent expired fourteen years later. Meanwhile drivers and inventors kept working on other solutions.
The lantern ran by gas and was turned by a lever at its base so that the right faced Traffic. This Traffic Light exploded,hurting the policeman that was operating it. Traffic light Installed. The first 4-way three color traffic light installed in 1920 on the corner Woodward and Michigan Avenues in Detroit. Electric automatic Traffic Light. Garrett Morgan Of Cleveland,Ohio realized the need to control the flow of traffic. A gifted inventor reportedly the first African American to own a automobile in Cleveland,Ohio he invented the electric automatic traffic light.