Conversation so far:
when did the speed limit change from 55 to 70 in texas
The speed limit in Texas increased to 70 mph in December of 1995.
when did the speed limit change from 55 in California
The speed limit in California was last raised in 1995 from 55 to 65 mph on most highways.

Question: Why did the two cities increase the speed limits
Self-contained rewrite: why did California and Texas increase their speed limits in 1995