Ever wonder why some out-of-service violations seem to stack on top of one another, or exactly when lighting-related issues will place a truck out of service? How about underride guards? Just how much damage is too much?

Today’s Trucking Editorial Director John G. Smith asked Kerri Wirachowsky – the Commercial Vehicle Safety Alliance’s director, roadside inspection program – to offer some insights into the most common questions that she fields from trucking operations.