A “bend” in a road is often a literary signal for a change, either good or bad. Adventure is waiting, danger and destruction are lurking, or a golden opportunity awaits the noble wayfarer who is on the journey of a lifetime. Contrast this to the “straight” road where things are peaceful and the future is visible, if only you will lift your head and look.
David in Psalm 4: 8 is asking for just such a straight road because of his enemies. It is interesting that we want a straight road from God but we always want the bend if means adventure and excitement. A contrast here is Isaiah 40:3 where WE are to make straight paths for God. Part of this “preparing” is to knock down hills and fill in valleys.
Hills, valleys, bends in the road, and straight paths so many paradigms and graphic 
images. All the words preached and ink spilled on paper using these icons can they be combined? Maybe! I tend to think horizontally and probably need to think more vertically (ah, more graphic images). If Jesus is in control and I do not purposely choose to bend off of His path why should our paths be anything but straight to God? WELL, what about all the tough times we encounter?
Join me now in a vertical look at a straight road that goes through hilly country. Do you 
bend down to go into a valley and then bend up to go to a hilltop? But I can’t see everything in front of me on that road! No, God never promised that you could always see everything in front of you He just said, “Follow Me.”
What about Isaiah 40: 3? Since the command there is that we make level paths so that God’s glory will be revealed; may I suggest that as we knock off high spots and fill in the low spots on the path for people behind us, it will be smoother and a little more level for them.
https://openclipart.org/detail/177913/on-the-road
Mark's Bible Study 
Pingback: The Bible and Science – Newton’s First Law | Mark's Bible Study