Modified License Oklahoma does not provide a work permit any longer. However, persons under a 180 day, one year, or three year revocation of driving privileges can usually obtain a License Modification. This modification can allow driving privileges 24/7 as long as a ignition interlock device is installed on the vehicle. The length of the revocation depends on prior revocation with the previous ten years. 1st=180 days, 2nd=1 year, 3rd= 3years. There is a $175.00 modification fee to be paid to the Department of Public Safety. Only Class D privileges can be modified. (No CDL mods) The modified license should be the last resort. The first goal is always to prevent license suspension instead.