How Many Questions Are on the Louisiana CDL General Knowledge Test?
50 questions. That count is fixed by 49 CFR Part 383, the same across every state — Louisiana's OMV administers the federal format rather than writing its own.
What Louisiana actually controls
The federal government owns the question count and 80% threshold. Louisiana's own contribution is the $15 CLP fee, one of the lowest nationally, and a genuinely generous retake policy: the knowledge test can be taken up to twice daily, across multiple days, with no extra fee.
Depending on the class and endorsements you're pursuing, additional tests — like Air Brakes or Combination Vehicles — may also apply on top of the General Knowledge test.
A 60-day CLP window
Once issued, a Louisiana CLP is valid for 60 days, shorter than many other states' CLP windows.
Federal rule still requires holding the CLP for at least 14 days before applying for the full CDL, so the practical planning window inside those 60 days is tighter than it first appears.
How our practice tests are structured
Our practice tests break results down by topic immediately, so a weak spot doesn't stay hidden inside an otherwise decent overall score.
Each question includes an explanation and a source reference, so you learn why an answer is correct instead of just memorizing a letter.
Frequently Asked Questions
How many questions are on Louisiana's CDL General Knowledge test?
50 questions, the federally standard length used nationwide, not a Louisiana-specific number.
What does the Louisiana CLP cost?
$15.
Can I retake the knowledge test if I fail?
Yes — up to twice daily, across multiple days, with no additional fee for retakes.
Ready to put this into practice?
Start a free Louisiana cdl practice testLast reviewed: 2026-07-22