A movie theater with similar construction would be a cell-phone free zone, but it would also be a dead zone for all other radios.
The issue is almost always trivial to fix:
Motor industry slams speed-curbing trial.
Your credebility is good with me.
Do the dimensions check out when you use a caliper?
The feature, dubbed Stolen Vehicle Slowdown, can use GPS to pinpoint a vehicle once it has been reported as stolen, and after OnStar confirms with local police that it has the vehicle within sight, it can then be slowed down remotely.