I have 220,000 miles all over the USA and Canada on bikes with my bride of 45 years. Never rode with a group. Always ride in the right or left "Rut". If you ride in the Center of your lane...you will be riding on a Hump..and the OIL patch...where the oil drips from cars and trucks land..don't want to be there. You always want to ride on clean pavement.
This "Oily" condition is particularly noted when riding into a toll booth. I figure my
Allotment of "Time" is at the limit..SO I have QUIT riding. I am 70
NB
PS: Picture a watermellon tossed out of a car at 60...