One of the things I've been thinking about recently is the question: "Are race cars safer in most crashes for the occupants than road cars?"

Now, I know a good portion of the safety in a race car comes from the roll cage, harness and Hans Device. But at the same time, with less mass (which may be a good thing?) no airbags, and less area devoted toward reducing the impact of the crash, in the same sort of deadly road crash would a race car make the occupants survive?

Let's consider three scenarios, and three cars. Our three scenarios are:
1. Head-on collision at 60mph.
2. T-Bone (driver's side) at 45mph.
3. Crash into strong, stationary, object (such as a concrete building) at 30mph.

(bonus scenario: Rollover down a hill?)

In all of these cases, serious injury or death is very likely for a road car, and are common to get into. Now the three cars to test:
1. WRC Car with Full Steel Rollcage, Harness, helmet, and Hans Device. Side-impact zones. 2 Occupants. No other safety equipment.
2. Extremely "safe" 4-door hatch. 10+ airbags, about 3000-3200 lbs, front wheel drive with a 4 cylinder engine, ABS. Priced around 20-30k. 2 Occupants, no other safety equipment.
3. Normal road car with full steel rollcage (but keeps all 4 seats) hardness, and 5-7 airbags, 5mph crash bumpers, 3300-3500lbs. Otherwise stock. Basically, a normal sedan that has been given a roll cage and harness. Occupants are not wearing Hans Devices or Helmets however, as it is being driven on the street.

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Which car do you think will give the least injury to the occupants in all three scenarios?

The ultimate question to answer here is: does adding aftermarket safety cages or equipment actually make a road car safer, rather than just driving a heavier/bigger car? Which is more important, the car's weight and equipment, or the roll cage, helmet and Hans device?