The driver of the UPS truck could have been distracted, impaired, overly fatigued, or driving recklessly or carelessly. A UPS driver could be guilty of running a stop sign or a stop light, driving more hours than allowed, exceeding the speed limit, making unsafe lane changes, tailgating, or driving while under the influence. Distracted driving behaviors may include talking on a cell phone, texting, eating, setting a GPS device, or daydreaming. Poor road conditions due to inclement weather are also a common cause.