Neb. Rev. Stat. § 60-4,144.04

(1) The issuance of a CLP-commercial learner's permit is a precondition to the initial issuance of a commercial driver's license. The issuance of a CLP-commercial learner's permit is also a precondition to the upgrade of a commercial driver's license if the upgrade requires a skills test, however, the CLP-commercial learner's permit holder is not eligible to take the skills test in the first fourteen days after initial issuance of the CLP-commercial learner's permit. (2) The CLP-commercial learner's permit holder is not eligible to take the commercial driver's license skills test in the first fourteen days after initial issuance of the CLP-commercial learner's permit.