"The highway was designated in June of 1964, and its route has been minorly altered since." - Small flow issue to end of the sentence. One suggestion "Since the road's designation in June of 1964, the route has undergone two minor alterations."
Changed, used your suggestion.
Route description
Looks good, no concerns.
History
"By 1964, the highway's surface had been improved to bituminous, a combination of crushed rock and asphalt." I would link Bituminous to
Asphalt. The article states that Bituminous and Asphalt are one in the same. Maybe a minor nitpick.
"The highway was designated in June of 1964, and its route has been minorly altered since." - Small flow issue to end of the sentence. One suggestion "Since the road's designation in June of 1964, the route has undergone two minor alterations."
Changed, used your suggestion.
Route description
Looks good, no concerns.
History
"By 1964, the highway's surface had been improved to bituminous, a combination of crushed rock and asphalt." I would link Bituminous to
Asphalt. The article states that Bituminous and Asphalt are one in the same. Maybe a minor nitpick.