August 6, 2015 5:00 pm Speed Trailers Go High Tech in San Diego San Diego police are implementing two new “speed trailers,” mobile signs that show you how fast you’re driving, in a new, high-tech fashion. NBC 7’s Artie Ojeda explains. US & World Videos 2:07 New study links consuming red meat with dementia 2:05 Police find, return dozens of abandoned Amazon packages 0:28 A Vermont state trooper plunges into icy pond to rescue 8-year-old girl 2:59 Keep these travel etiquette tips in mind this holiday season