Pedestrians must be careful near roadways, because a distracted driver or one who is speeding could cause an accident. Someone who walks near the roads while distracted can also put his or her own life at risk.
While it's nice to think that people always obey the rules of the road, the fact is that people don't. Speeding, texting while driving, looking away from the road to break up an argument in the car and other kinds of situations can cause collisions. Drivers may think that just a second or two doesn't matter, but for a pedestrian crossing the road, every second counts.