What looks like a rolling picnic cooler stops at the crosswalk, waits for a car to pass and then navigates its way at a leisurely pace down the sidewalk in suburban Washington.
![](https://wp.greenwatchbd.com/wp-content/uploads/2020/04/Robots-ride.jpg)
What looks like a rolling picnic cooler stops at the crosswalk, waits for a car to pass and then navigates its way at a leisurely pace down the sidewalk in suburban Washington.