On this day: The first tri-color traffic signal was installed in Detroit in 1920On this day in 1920, the way people drove was changed forever when a Detroit traffic cop installed a four-way, tri-color traffic signal on Woodward Avenue in Detroit.
Head-and-neck restraints and soft walls top list of NASCAR's biggest safety improvementsTo mark NASCARโs 75th season, The Associated Press interviewed 12 key contributors to the industry on multiple topics.