Use your mirrors. Glance in them every few minutes - more frequently in traffic. What is behind you can be more dangerous than what is up front.
Before overtaking or changing lane, always double-check (as suggesed above) by actually taking a quick look back to cover the blind spot that the mirror does not.
Maintain a minimum of 2 seconds between you and the vehicle in front of you - more when the road surface or visibility is less than ideal.
Enjoy the ride.
"There is no joy in arrival, but there is in JOurneY!"