Final answer:
If a driver fails to complete a remedial or refresher course as required, the Taxi and Limousine Commission will usually suspend the license until the driver meets the compliance standards.
Step-by-step explanation:
If a driver who has been required to attend a remedial or refresher course fails to complete such course, the action that the Taxi and Limousine Commission (TLC) will typically take is to suspend the license until compliance. While revocation of the license is a possible consequence for more serious infractions or non-compliance, immediate suspension is a more likely step for failure to complete a required course. After suspension, the driver would need to satisfy the requirements set forth by the TLC to have their license reinstated.