Driven to Distraction is a game in which players have to try to read and answer text messages that pop onto the screen while a view of the road scrolls along. While answering the messages players also have to look out for road signs and stop whenever a stop sign appears. The game is pretty basic, but effective. It should be noted that the game is hosted by Kwik Fit which is a UK-based tire store so the hosting of this game is probably more of an SEO play than anything else.
Cards of Distractability is a game that challenges players to respond to text messages from a friend while also taking note of the road signs while traveling down the road. At the end of the game players try to identify which signs did or didn't go past them. This game is hosted by a law firm that is probably hosting the game as an SEO tactic (it worked).
And on a related note, here's a video about testing your ability to make observations about changes around you.