But also more heavily used and it's surprising how quickly a once nice stretch of road can get worn down & beaten up.
So maintenance never ends.
Should also say: because of increased traffic, at least half, maybe 3/4, of Interstate grade highways need expansion & upgrades -- from four lanes to six, or six lanes to eight, eliminate those *+#* *^#*! clover-leafs, etc.
Point is: for all the work that has been, and is being, done vastly more needs to be planned.
Cloverleafs may be fine for little-used rural interchanges, but major urban highways need flyovers:
