What could be worse than breaking down at night on the highway is not being seen by passing traffic. A set of Roadside Safety Discs from Tactical Outfitters should provide a measure of security. Each four-inch-diameter waterproof and shockproof disc can be set to nine different flashing modes that, according to the manufacturer, can be seen from up to 5,000 feet away, or nearly a mile. The device uses three AAA batteries. A floodlight setting could come in handy when working under the hood or just for general illumination, and the magnetic base lets you attach the light to your vehicle. Purchase three discs for $48, six for $72 or 12 for discs for $120 at www.1tac.com.