https://www.automatesystems.co.uk/road-blockers/
I'm 90% joking but for the 10% that isn't....
Let's think about the cost of installing these in 100 of the intersections that are estimated(1) to be most likely to have a dangerous runway incursion.
I'll guess each install will be about $5 million to $10 million, not counting the planning, permitting, and loss of revenue due to the runway entrance being inop during the install.
An additional $50m for systems and software updates per airport where these are going to be installed. Let's estimate 10 airports in the US would get a system.
An additional $100k per year for each one for maintenance. Motors, hinges, sensors, wiring, etc.
Since they will potentially damage aircraft through inadvertent deployment, let's add $50k each per year for insurance.
How much actual loss has occurred due to runway incursions at these 'worst' 100 intersections in the last 25 years in the US? As far as I can tell(2) $0
There were 4 accidents in the US in the 90's, and 1 in the 80's. I'm sure there have been many close calls, but nothing notable.
While we often hate to think of it this way, is this proposed expense ($1.25 billion initial outlay plus $15 million annually) a good deal compared that to an expected payout per passenger(3) of less than $5 million? Not if you look at the current system and its realized risk profile. Yes, we've had some close calls, but things like a go-around are part of the current system and they have been working.
1: We can spend maybe 10 million dollars to do a study to determine this.
2: https://en.wikipedia.org/wiki/Runway_incursion
3: https://www.iii.org/article/airplane-liability#:~:text=Among airlines based in modern,%24700 million to nearly %241.3