Today, Google Doodle honours the 101st anniversary of the first electric traffic signal which was installed in America.
This doodle features a hand made picture with animation featuring the roads with vintage cars skidding to a stop and speeding along illustrated by Nate Swinehart. The first electric signal was installed in Cleveland Ohio on August 5, 1914.
Google Doodle Official website, "Doodler Nate Swinehart hearkens back to an earlier time with shades of black and white, and uses the background colors to make the red and green signals particularly luminous. It's not an artistic coincidence that the cars leap forward and screech wildly to a halt, either - the yellow light wouldn't appear for several years, and overzealous motorists had to stop on a dime."
Generally, the Google Doodle is a temporary alteration of the logo on Google's homepage that is intended to celebrate holidays, events, achievements and people.
The first doodle was designed by Larry Page and Sergey Brin to honour the Burning man festival back at 1998. The Google Doodles is organized and published by a team of employees termed "Doodlers".