Three-wheel vehicles are unstable when the single wheel is in front. Where there are two wheels in front, and one in the back, they are very reasonably stable.
Check the Can-am Spyder.
Pretty neat. Weight far forward, 2 wheels in the front. Appears a pretty stable design. But it is a motor cycle.
2 wheel motor cycles are pretty safe on dry pavement. If the idiots driving cars make allowances for them.