PD wrote:

"SR works at high velocities and low velocities. Classical
mechanics also works at low velocities, but *only* at low velocities.
If you'd *rather* use classical mechanics (and concepts) at low
velocities, by all means do so. But if you want to ask which is *more
correct*, then you have to go with the one that works at all
velocities, and that would be SR. "

No, SR obviously doesn't work at "slow" velocities. For instance, if a
car could move at 8 km/s, it would not stay on Earth!
Otoh, the path of particles moving at high velocities must be
controlled by magnetic and/or electric fields, which are not taken into
consideration in the derivation of SR.
Claiming, like Randy Poe, that "lots of things predicted by SR are
verified on accelerators",  is  indulging in wishful thinking. Those
things, which are not "a lot", don't need SR to be explained (ask for
instance Ilja Schmelzer).

Marcel Luttgens