CDL Digest has been committed to providing up-to-date information and study guides for Commercial Learner’s Permit (CLP) and Commercial Driver’s License (CDL) applicants since 2006. CDL Digest understands just how frustrating and time consuming it can be to get your hands on all the information you need, whether you are an individual who is interested in obtaining a Commercial Learner’s Permit (CLP) for the first time or a Commercial Driver’s License (CDL) holder with years of experience. Our website and study guides have already helped thousands of people to easily pass their written exams.