New Orleans attack would've had 'completely different outcome' if steel barriers were used, inventor says

[forgotmylogin]

6. I know there exist those temporary concrete barriers for road construction.

In my brain, I'm wondering if several rows of of regular cinderblocks laid out on a road strategically in a grid would serve to stop or slow a speeding vehicle. They're not huge, but seems they would act like caltrops and cause axle and tire damage if someone tried to speed through them.