Trans 301.21 HistoryHistory: Cr. Register, March, 1982, No. 315, eff. 4-1-82; am. (1), Register, April, 1997, No. 496, eff. 5-1-97. Trans 301.22(1)(1) In addition to the requirements under 49 CFR 393.77, a heater shall maintain an inside temperature of not less than 50° fahrenheit throughout the HSV at average minimum January temperatures as established by the U.S. department of commerce, weather bureau, for the area in which the bus is to be operated. Trans 301.22(2)(2) The heater hose shall be adequately supported to guard against excessive wear or abrasion and may not interfere with or restrict the driver. Heater hose or lines inside the driver or passenger compartment shall be shielded to prevent accidental contact by driver or passengers. Trans 301.22 HistoryHistory: Cr. Register, March, 1982, No. 315, eff. 4-1-82; am. Register, April, 1997, No. 496, eff. 5-1-97. Trans 301.23(1)(1) Every HSV originally equipped with any of the following instruments, warning devices, or gauges shall be maintained with that equipment or a comparable replacement in good working condition: Trans 301.23(1)(a)(a) Air pressure or vacuum, where air or vacuum brakes are used with low energy supply warning system. Trans 301.23(2)(2) The gauges or instruments shall be mounted in such a manner that each is clearly visible to the seated driver. Trans 301.23 HistoryHistory: Cr. Register, March, 1982, No. 315, eff. 4-1-82; r. and recr. (1) (intro.), am. (1) (a), Register, April, 1997, No. 496, eff. 5-1-97. Trans 301.24(1)(1) The interior of an HSV shall be free of all unnecessary projections likely to cause injury. This standard requires inner lining on ceilings and walls. Trans 301.24(2)(2) The interior of the HSV shall be kept free of litter or debris. Trans 301.24 HistoryHistory: Cr. Register, March, 1982, No. 315, eff. 4-1-82; am. (1), r. (2) and (3), renum. (4) to be (2) and am., Register, April, 1997, No. 496, eff. 5-1-97. Trans 301.25(1)(1) The lights, lamps, and reflectors required for an HSV shall conform to the requirements for color, position and type under 49 CFR 393.9 to 393.26, and required by ch. 347, Stats. Trans 301.25(2)(2) All lights and lamps shall be operational and the reflectors may not be damaged or broken. Trans 301.25 HistoryHistory: Cr. Register, March, 1982, No. 315, eff. 4-1-82; am. Register, April, 1997, No. 496, eff. 5-1-97. Trans 301.26(1)(1) HSV mirrors shall comply with the requirements of 49 CFR 571.111. In addition, every HSV with a GVWR of more than 10,000 pounds shall have an interior rearview mirror at least 6 x 30 inches overall. There shall also be 2 exterior clear view outside rearview mirrors, one to the left and one to the right of the driver. Area of each mirror shall be not less than 50 square inches overall. Each mirror shall be firmly supported and adjustable to give driver clear views past left rear and right rear of vehicle. The right outside mirror mounts shall include a side angle adjustable convex mirror to provide an additional close-in field of vision located so as not to reduce the visual field of the flat surfaced mirror below 50 square inches, or as an option, have a front mounted mirror; these shall provide a view from the service door rearward. Trans 301.26(2)(2) Each HSV with a GVWR of 10,000 pounds or less shall have: Trans 301.26(2)(b)(b) Two outside rearview mirrors. One shall be on the right side and one on the left side of the vehicle. Trans 301.26(3)(3) Every HSV except an automobile or station wagon transporting minors shall be equipped with a 7 inch cross-view mirror providing a reflection of the road from the front bumper to a point where direct observation is possible. Trans 301.26(4)(4) Mirrors which are cracked, broken, or clouded shall be replaced.