Lane assist, the superhero sidekick of modern driving, is here to save the day – or at least prevent some bumper kisses. Using sensors, it alerts drivers who seem to think lanes are just suggestions, issuing warnings for everything from sleepy swerves to tailgating or blind spot blunders. Debuting in 2004 in a fancy Infiniti, lane assist is now as common as GPS in high-end cars and is even sneaking into budget models. Who knew our cars would start nagging us like a concerned parent?