NJ Turnpike and GSP bridges

[J Route Z]

Will all the bridges on these roads eventually be white concrete, making that high pitched sound when you drive over them? They have small grooves. For instance, this bridge is concrete: https://maps.google.com/?ll=39.99606,-74.865003&spn=0.017556,0.042272&t=m&z=15&layer=c&cbll=39.996342,-74.864582&panoid=-vTljueLhVLdswJhxh0JaQ&cbp=12,41.03,,0,18

This one, however is different: https://maps.google.com/?ll=40.487954,-74.396238&spn=0.01756,0.042272&t=m&z=15&layer=c&cbll=40.488205,-74.396223&panoid=WRMQGXowwdUqbeWgLTde5g&cbp=12,43.71,,0,6.76

And this too: https://maps.google.com/?ll=39.854312,-75.099835&spn=0.017724,0.042272&t=m&z=15&layer=c&cbll=39.854577,-75.099576&panoid=YXlL-BCk5AGlkdHBjxtmBQ&cbp=12,275.85,,0,15.35 along with many others.

[hotdogPi]

I have heard the noise on New York bridges too.

[Zeffy]

Will all the bridges on these roads eventually be white concrete, making that high pitched sound when you drive over them? They have small grooves.

That noise is (understandably) satisfying to hear when you drive over it. I know there are some on US 202 that make that sound, while others (such as I-287) produce deeper pitched sounds.

Oh and rumble strips. Hearing those while slowing down on the exit to NJ 29 on I-95 is amazing.

[Alps]

Bridges are naturally concrete. In order to make an asphalt bridge, you're putting asphalt over the concrete, and it can then start cracking at joints and ripping into potholes down the road. Makes much more sense to do the whole bridge as concrete.

[cpzilliacus]

Bridges are naturally concrete. In order to make an asphalt bridge, you're putting asphalt over the concrete, and it can then start cracking at joints and ripping into potholes down the road. Makes much more sense to do the whole bridge as concrete.

When the Capital Beltway and some other Maryland freeways were built in the 1950's and 1960's, bridge decks were asphalt over concrete.  Some of those old blacktop decks are still in place, but many have been replaced with new cast-in-place (and all concrete) decks.

EDIT:  It occurred to me that the one new-ish freeway class road that I have seen with asphalt (surface) bridge decks is Highway 407 in Ontario (GSV example here).