Variable speed limits or VSL's use available information on the roadway, like traffic speed, the number of vehicles, and road surface conditions to determine appropriate speeds and display them to drivers in real-time.
The 5.8-magnitude earthquake that unnerved millions of people on the East Coast of the United States on Tuesday forced schools in three states to close and damaged several buildings and federal landmarks.
At least four aftershocks followed the powerful quake, including a 3.4-magnitude tremblor that hit near the nation’s capital overnight.
An earthquake epicentered in Virginia occurred Tuesday afternoon, with people in Washington, DC, New York, Ohio, North Carolina, Massachusetts and Toronto reporting they felt the tremors, as well.
Reports thus far indicate the quake registered a 5.9 on the Richter scale.
Here’s a look at some interesting events that took place on this day in history:
1788 – Virginia becomes the 10th state in the Union (More info)
1876 – Lt. Col. George A. Custer and his men are killed at the Battle of Little Bighorn (More info)