The correct punctuation is: " Welcome," Mindy greeted the crowd at the special event.
I would say that the similarities between the two would be that the main characters are in the minority for their beliefs. In Fahrenheit 45, Guy Montag is interested in books and does not want to burn them. In To Kill A Mockingbird, Atticus and Scout do not believe that other races should be treated differently.
I believe they are. This congestion pricing would make tolls for busy highways and help easy some of the congestion because most people would start to car pool, which would help cut some of the congestion down.