Driving Safety: Signals, Signs and Pavement Markings II Questions taken from the PA Drivers' Manual Progress Indicator: Question 4 of 27 4.  Up to how much hose is used with a supplied-air respirator? p. 385 Choices: 400 feet (122 m) 600 feet (182 m) 200 feet (61 m) 300 feet (91 m)