Southwest Regional Drager BG4 Exam Taken from the 2019 Southwest Regional Mine Rescue Contest held in Ruidoso, New Mexico Progress Indicator: Question 6 of 30 6.  How soon are regularly used travelways required to be sanded, salted, or cleared of snow? Choices: before the beginning of the shift within 3 hours immediately preceding the beginning of the shift within 24 hours as soon as practicable none of the above