Recently adopted by Currie eBike offerings, the application of specific gearing and severe current regulation, allows a 20mph motor only speed but with substantial assist actually increasing right till near 30mph. This comes near to legally allowing my personal safety mode of blending with in-town traffic.
I just choose a vehicle that I can see over and hop in behind it and use it as a traffic, and wind, blocker - not too close!
I also advocate the use of a modest power strobe headlight, wide pattern preferred, right at rear view mirror height ... for thum door kickers!.
A recent enhancement I added, for side traffic, is a reasonably clear screw on bottle cap over the lens.
This provides greatly increased side visibility and a larger, though slightly dimmer, frontal strobe. - more noticeable! ?
Red flashing tail light also.