Here are the words with differing stress patterns from the others:

1. **traffic** - A. is stressed on the first syllable, whereas the others (B. respect, C. safety, D. pavement) are typically stressed on the second syllable.
2. **prohibitive** - A. differs as it has three syllables with stress on the middle one, while the others (B. reverse, C. protect, D. limit) are either two-syllable words or stressed differently.
3. **congestion** - B. is also stressed differently compared to the others; it has stress on the second syllable (A. obey also has a different stress, but allows for first syllable stress.)

So, the words with different stress patterns are:

1. A. traffic
2. A. prohibitive
3. B. vehicle
4. B. obey

Each selection varies in syllable stress compared to the others.