Dual-tasking slows reaction time. Some people may pride themselves in multi-tasking, but when you are spreading your concentration over multiple activities, you choose what tasks you are thinking about the most. For instance, walking home and talking on the phone. Concentration is divided between walking, holding the phone, the conversation, the stop lights, and the road. What stops you from walking into oncoming traffic?
Source: www.apa.org/monitor/2009/02/dangerous.html
