"Test deck?"

[cbeach40]

Unfortunately imgur uploads my photos out of order, so I'm not sure where it is on the 400. I'll have to check my computer later, which has the photos in order.

Right here, just north of Port Severn:
https://goo.gl/maps/5TzUBPpgbTu

[KEVIN_224]

I could swear there is, or was, a tiny road test area on the New Jersey Turnpike northbound. I just know it is, or was, northbound, between the car and truck/bus lanes, adjacent to one of the service plazas. It might possibly have been the roadway at one time and some widening cut that little section off.

[GaryV]

In a similar vein, back when I was a kid there was a sign on I-96 (I think) - "Experimental Delineator Spacing".  A columnist in the GR Press wrote about it in a humorous vein, figuring out what a delineator was in the first place, and then asking MDOT what the experimental spacing was.

[SSOWorld]

https://goo.gl/maps/xqnGm8r8zEJ2

One of two on US-51/I-39 near Portage, WI

[UCFKnights]

I-95 near Rockledge, FL has some https://www.google.com/maps/@28.3085572,-80.760773,3a,75y,144.69h,56.09t/data=!3m6!1e1!3m4!1sledmZKbS-2WBC8jENhwWsw!2e0!7i13312!8i6656!6m1!1e1

Its in 2 spots a few miles apart, one on the asphalt and one on the concrete, both in the right travel lane. I assume the location was picked to have similiar vehicles/counts go over the same striping on both concrete and asphalt surfaces to see what holds up better?

[7/8]

Unfortunately imgur uploads my photos out of order, so I'm not sure where it is on the 400. I'll have to check my computer later, which has the photos in order.

Right here, just north of Port Severn:
https://goo.gl/maps/5TzUBPpgbTu

Thanks cbeach40

[Pete from Boston]

There's one off the Maine Turnpike in York:

https://goo.gl/maps/pWpiHDHFruo

[jlwm]

I-10 (East Fwy.) in Houston WB just east of the interchange with I-610 and US 90.
https://goo.gl/maps/PPktB5kD3xv

[7/8]

I just found one this evening on A-10 east in Quebec between exits 100 and 106

https://goo.gl/maps/HAmDgJ2cUwp

[7/8]

And today I found one on A-10 WB between exits 115 and 118 near Magog, QC

https://goo.gl/maps/gkYoZNim1UM2

[Thunderbyrd316]

   There is one here in Oregon on Oregon 22 just west of Stayton in the number 2 westbound lane.

   Link: http://gokml.net/maps-azteca.php#ll=44.823934,-122.812235&z=14&t=r