Over 1.5 million people drive through the Mojave Desert each week. Interstate 15 and 40 have become major arteries for tourism and commerce. Traffic on the I-15 has more than doubled in the past 10 years. Las Vegas and Laughlin rely heavily on Southern California to provide over 40% of its visitors. For over 20 years Highway Radio has been surveying Southern Californians during their drive to Nevada gambling destinations. "THE BRIEFING" is a monthly newsletter of qualitative and quantitative statistics. This quick read gives you a thumbnail sketch of Southern California, Las Vegas, and Laughlin visitors. Also available are the auto counts on the I-15 and I-40 and marketing trends.