Answer: 46 inches Explanation: Don't forget the wire mesh...... 
JP Express Demolition & Excavation, Inc. 
Answer: 46 inches Explanation: We recommend 4000 psi w/ 6" is best for driveways, but mainly concrete is poured at 3500 psi 4 " thick.
We also recommend using all natural sand that is not blended or man made in your mix from the concrete supplier. It cost a little more but you get what your paying for. Quality is better than additives or fillers. 
TNT Concrete INC. 
Answer: 46 inches Explanation: Depending on the weight that will used on the driveway will be a key factor of thickness. 
RP Enterprises 

ProMatcher 
Answer: 24 inches Explanation: I'm not an expert in residential driveways but I was successful in calculating, pouring, and finishing my own driveway by hiring an expert who actually knew what he was doing. Thanks Ron! 
COMMON SENSE FLOORING, INC. 
Answer: 46 inches Explanation: Concrete slab are pour at between 46 inches for regulation. 
Treasure Coast Concrete Polishing 
Answer: 68 inches Explanation: I recommend 6" 3500PSI4500PSI concrete slabs to all of my clients wanting to install a new driveway. It might be cheaper in the short run to install a 4" 3000PSI concrete pad, but a 6"8" pad will last much longer. 
Cronin Construction & Resource Management, LLC 

ProMatcher 
Answer: 46 inches Explanation: This is the average thickness for driveways in these areas 
Concrete Designs 
Answer: 46 inches Explanation: 2 inches just isn't gonna cut it with any kind of traffic on it 
Phoenix concrete services inc. 
Answer: 46 inches Explanation: the least you would want to pour anything is 4" 
caydens concrete restoration inc 

ProMatcher 
Answer: 46 inches Explanation: Normal 4 is good enough. Anything other than that is just a waste of concrete other than low areas of course 
SouthPac Construction 
Answer: 24 inches Explanation: Home builders are not going to spend more money than they have to when installing a driveway, they also do not allow enough curing time before allowing anything heavy on it. Thats why they crack after years of driving on them. 
Charlton Team Home Renovations & Construction LLC. 
Answer: 46 inches Explanation: Place concrete at a minimum thickness of 4 inches. Increasing the thickness from 4 inches to 5 inches will add approximately 20% to your concrete cost, but will also boost your driveway's loadcarrying capacity nearly 50% 
Colorado Concrete 

ProMatcher 
Answer: 46 inches Explanation: 4" is generally thick enough. If heavier vehicles will be parking on it then thicker is better. 
A New Design Landscape & Stone, Inc. 
Answer: 46 inches Explanation: 4 inch of concrete with rebar on 24 inch centers each way supported with rebar chairs is a good driveway for cars and trucks . Thicker for trash trucks and rv's. 
Concrete services 
Answer: 46 inches Explanation: Typical driveway is 4" minimum thickness. 
BellPro Construction LLC 

ProMatcher 
Answer: 46 inches Explanation: 4 inches is the bare minimum for a concrete driveway. Five or 6 inches is best with proper reinforcement embedded in the concrete . 
New Age Construction 
Answer: 46 inches Explanation: 4 inches is standard 
DIRTCO CONSTRUCTION 
Answer: 46 inches Explanation: Installing a concrete driveway should be 4 to 5 inches thick and all edges should be turned down at 6 to 7 inches thick all the way around the drivrway 
Lals Concrete Company,LLC 

ProMatcher 
Answer: 46 inches Explanation: sidewalks should be 4"
driveways 6" 
LPG,LLC 
Answer: 24 inches Explanation: Residential concrete driveways are typically 4" 
Concrete & Beauty Design 
Answer: 46 inches Explanation: You could add fiber for strength 
Garcias Concrete Service LLC, 