Question Unless otherwise posted, the speed limit in an alley is: Answers 15 mph. 30 mph. 45 mph. 55 mph. Explanation When driving in an alley, the speed limit is 15 miles per hour. If a different speed limit is posted, follow the posted speed limit. Pass your DMV Written Test with flying colors Take me to the cheat sheet Texas This questions appears in the following tests: Texas Practice Test 30 Texas Practice Test 1