More than half of all traffic infractions in Manhattan were tossed out of court last year while the borough’s overall dismissal rate for drunk-driving and other felony vehicular offenses rocketed to 15% — more than double 2019’s dismissals, disturbing new records show. Critics blamed the startling statistics on a controversial evidence reform law enacted by state lawmakers — one even soft-of-crime Manhattan District Attorney Alvin Bragg concedes is a big problem.