Short trips are more dangerous per-mile, and per-minute, than long trips. A minute of driving to the corner store is vastly more prone to accident than a minute

Short trips are more dangerous per-mile, and per-minute, than long trips. A minute of driving to the corner store is vastly more prone to accident than a minute of driving a stretch of interstate. NYC to LA probably has a higher risk than driving to the corner store, but only because you stop by the corner store every so often on the trip. So it may not be the case that the short trips "dilute" the statistics, especially per-mile.