Whether you’re making your daily commute to work or going on a trip, road conditions make all the difference. Nowhere offers perfectly smooth drives 100 percent of the time, but there are definitely places that are worse off than the rest. We did some digging to find out which states have the worst and best road conditions. The IRI helps determine each state’s percentage of roadway miles deemed “acceptable” for driving. Here are some common examples and the best ways to react to them.