This is the most likely scenario.
The sign came up with no warning: HW-597 — accident ahead. Her stomach folded. There was nothing unusual about a sign like that — the dash ticked over, tires hissed — but the world contracted, the way it does when something begins to rearrange the furniture of your evening. She eased off the accelerator, the engine complaining in a soft, rusty whisper, and watched the taillights bleed into brake lights and then into red, a soft congregation stretching ahead. hw-597 driver
Features an onboard jumper/shunt to switch between 3.3V and 5V logic levels. This is the most likely scenario