25 Pa. Code § 271.375
(a) The Department may require the operator to obtain and provide proof of coverage for additional liability insurance if one of the following applies:
The provisions of this § 271.375 adopted April 8, 1988, effective April 9, 1988, 18 Pa.B. 1681.
This section cited in 25 Pa. Code § 271.371 (relating to insurance requirement); 25 Pa. Code § 271.376 (relating to maintenance of insurance coverage); 25 Pa. Code § 271.377 (relating to insurance pool); and 25 Pa. Code § 271.392 (relating to commercial insurance; general requirements—persons other than municipalities and municipal authorities).