Diesel Law Exam No. 1 Questions taken from the Pennsylvania Bituminous Mine Officials Exam Study Guide Progress Indicator: Question 2 of 15 2.  Inaccessible Areas – All areas of the mine where team travel is blocked by one of the following conditions except. Choices: Unsafe Roof (rib to rib) that cannot be supported or scaled Inextinguishable fires Water over knee deep Yellow Caution Tape