overtaking sight distance
two times the overtaking sight distance
three times the overtaking sight distance
five times the overtaking sight distance
less than overtaking sight distance
equal to overtaking sight distance
more than overtaking sight distance
none of the above
increases with increase in speed
decreases with increase in speed
is same for all speeds
30m
60m
120m
180m
to increase it on descending grades and to decrease it on ascending grades
to decrease it on descending grades and to increase it on ascending grades
to increase it on both descending and ascending grades
to decrease it on both descending and ascending grades