What are the general recommendations for the start of traffic cones/flares on roadway operations at 25 MPH, 40 MPH, and 60 MPH? (205.07A)
a) 20 feet, 30 feet, 40 feet
b) 30 feet, 40 feet, 50 feet
c) 40 feet, 50 feet, 60 feet
d) 50 feet, 60 feet, 70 feet