Thank you for the invitation to join this contest. #42 #43 #44 #45 - a pentagon design with V shapes which also make directional arrows. Each of the five colours used in #43 and #45 could be used to represent the five highways.
#71 - another version of the five V shapes colour coded for the five highways. #72 shows how the the V could be used for idenfying a highway (the name would be underneath Viadom). Please see my entry #64 in the Dovicon contest where the V is turned and used as a D.
#77 - a version of #45 with a yellow instead of orange. The yellow would have to be more orange than the Dovicon yellow as it will not show up so well against white in comparison to the other colours.