Even in daylight, the screens have shitty contrast. Look at the photo. All the real street signs are high contrast and clearly visible. In the second photo, the sign is terrible to read - you wouldn't be able to read it well as you drive past. You'd actually have to pull in.
It's also redundant in that photo - a Clearway sign next to a No Stopping sign?
They address that in the last sentence:
> And for folks who have trouble reading dull, iron-colored screens, they also feature little lights that illuminate the text at night.