Marko,
The speed bumps idea was ditched a decade ago. You cannot put speed bumps on major road arteries. Emergency services would be critically effected and the constant up and down of heavily laden trucks (see Negril Today April 30 - https://negril.com/nt/nt043020.html ) would destroy the roadway.
I will present a few of the most Covid related suggestions from your list of ideas.
Thanks!