This arachnid snuck into a speedometer
Keeping an eye on the speedometer should not take up much of your attention. But if you want to avoid any tickets, you should make sure you are driving below the limit. And if you see something like this, try not to panic.
Warning: do not try to dislodge it by bringing the dialup to ninety. It would not only be very dangerous but would also earn you a hefty fine. Just wait, it will probably leave on its own.