Texas restriction codes are as follows:
A With corrective lenses
B LOFS age 21 or over
C Daytime only
D Not to exceed 45 MPH
E No expressway driving
I M/C not to exceed 250 cc
J Licensed M/C Operator age 21 or over in sight
K Moped
L Vehicle w/o air brakes - applies to vehicles requiring CDL
M CDL Intrastate Commerce only
P Stated on license
Q LOFS 21 or over vehicle above Class B
R LOFS 21 or over vehicle above Class C
S Outside mirror or hearing aid
T Automatic transmission
U Applicable prosthetic devices
V Applicable vehicle devices
WPower steering
So R would required a licensed operator 21 or over in the front seat. They went through all that in driver's ed, remember?