One of the adverse effects I discovered running Sat-Nav is the Tractor Beam Effect.
Oh, you think the "tractor beam" is the thing of Star Speck science fictionalism? Turns out, if you are the guy with the nav, and know the way, various elements may become magnetically attracted to your trajectory, as if by "tractor beam."
Even if those "elements" follow too closely and are discovered to have failed brakes . . .
A FireTruck in a parade, followed closely by two competing marching bands.
After seeing those following distances, and learning that one of the bikes was running on a brake failure, I changed my Sat-Nav protocols . . .