Looks like car-centric infrastructure just got a whole lot less sustainable. 
TBF though, cost of everything is increasing.
I bought 7 joints (20 foot lengths) of 1/2” type L copper last week on Monday. Paid 1.75 a foot on it, no bulk discounts, etc.
I bought two joints of copper today, they cost me 2.48 a foot.
In the span of less than 14 calendar days the price on 1/2” copper pipe has increased approx .75¢ a foot. And thats wholesale, not retail. Big copper like 2” and up is butthole puckering expensive.
price jump on schedule 40 pvc has doubled the cost of large pipe like 4”-8”. It increases like every week and a half or two weeks. Small pvc is more in line with the increase on copper. Sch 80 is the same.
Same thing with crosslinked poly water line and poly gas line. Gas risers are up 50%. Small parts like straps, screws, etc. A sheet of 23/32 plywood, nothing fancy, is 50 bucks now. Fucking OSB is like 23-25 a sheet.
Sorry to spoil your “fun” but it aint just highyway construction costs that going up.