DALLAS — As North Texas moves through the end of April and into May, the region is entering one of its most active periods for severe weather. This time of year often brings multiple rounds of storms, sometimes within just a few days. That setup creates more than just a weather concern. It can also have a significant impact on traffic, especially during peak travel times. Severe weather does not have to be extreme to create problems on the roads. In many cases, it begins with a quick downpour.