Answer: 4,000 PSI Explanation: Many contractors pour 3500PSI driveways. Overtime, this strength of concrete is prone to cracking if under repeated load. 
Cronin Construction & Resource Management, LLC 
Answer: 4,000 PSI Explanation: The question is incomplete compressive strength is largely determined by the traffic that the driveway is intended to service. Our standard residential driveway mix is 4000 PSI 
Maven Group LLC 
Answer: 4,000 PSI Explanation: Its minimum psi strength reccomended to withstand the elements and durability of average size vehicles. 
BAT Concrete llc 

ProMatcher 
Answer: 2,500 PSI Explanation: 2500 psi is standard.
We like to install 3000+ psi 
QUALITY CONTRACTORS 
Answer: 4,000 PSI Explanation: A pound per square inch (psi) is the unit of measurement used to describe the compressive strength of concrete. The most desirable strength for driveways varies based on climatic conditions. In broad terms, the colder the climate the higher the desired psi. Areas which experience large numbers of freeze and thaw cycles also require a higher psi concrete mix design. The typical concrete strength used for a driveway is in the 3000 psi to 4000 psi range, although temperate areas of the country may use lower strengths 
Colorado Concrete 
Answer: 3,500 PSI Explanation: Most Driveways are reinforced at 3500 psi 
Design4 

ProMatcher 
Answer: 3,000 PSI Explanation: This really depends on the application, but most residential driveways can us 3000 psi with no issues. 
Alliance Construction 
Answer: 4,000 PSI Explanation: 4,000 psi is recommended for vehicle parking 
BellPro Construction LLC 
Answer: 3,000 PSI Explanation: We always use at least 3000 psi concrete. 
A to Z Fence and Concrete 

ProMatcher 
Answer: 4,000 PSI Explanation: This is the min standard as per code 
h and h company 