Would I be able to stand my ground or just give in to the law of the
jungle?

The speed limit on the road I described is 30mph. It has two schools and a
20mph speed limit in front of each. It also has a huge curve and a
grade-level railroad crossing at the end of a mile-long straightaway.
Still, the average speed driven on that road is 45, regardless of who is
walking or biking along the shoulder. If your town is like mine, my guess
is that you'd have to move AT LEAST 30mph on your trike (yeah, RIGHT!) or be
physically driven off the road.