Yes, in general, a properly plugged tire can be driven on, but the honest answer depends on how the plug was done, how the tire is used afterward, and how long you intend to rely on it. Treating a plug as a permanent fix is where drivers get into trouble.
A tire plugged correctly should hold air and drive normally at regular speeds for daily use. It's common industry guidance to treat a plug as a get-you-by measure and follow up with a proper plug-patch repair from the inside of the tire as soon as it's convenient, rather than leaving a plug-only fix in place indefinitely.
A slow leak returning days or weeks after a plug, a hissing sound, or the tire pressure warning light coming back on are all signs the plug isn't holding. Don't wait for it to go fully flat again — get it properly patched from the inside or replaced before it fails at speed.
If your tire was plugged as a quick fix, the more durable option is a full plug-patch repair, which seals the puncture from both the outside and the inner liner. A mobile tire repair can perform this properly on the spot for $49 flat, and if the tire is beyond repair, mobile tire replacement is available with the tire quoted separately.
A properly done plug can generally handle highway speeds for a limited time, but it's best treated as temporary until it's backed up with a proper inside patch.
This varies a lot depending on the plug quality and driving conditions; standard guidance is to have it properly patched from the inside rather than rely on the plug indefinitely.
Treat that as the plug failing. Book a proper tire repair or replacement rather than repeatedly re-inflating it.
Yes. A roadside tire repair can include a full plug-patch combination applied correctly, for $49 flat, typically within 10–20 minutes of booking.