posted by John .
1. The traffic is heavy.
2. The traffic is light.
(Is this(#2) the opposite of #1?)
3. Cars are bumper to bumper on the street.
3-1. The street is crowded with cars.
(Are both the same?)
Yes, 1 is the opposite of 2.
And, yes, 3 and 3-1 are basically the same. (3 implies more dense crowding than 2 does.)