I have purchased a plot with an older workshop/garage. I would like to store a modern car weighing 2.3 tons there during the winter and wonder if it is safe to do so with the raised floor that exists.

The floor is supported by 145x45 60cc, spans 3.6 meters, with a 20mm chipboard and 20mm pine plank on top.

If it isn't strong enough, is it sufficient to reinforce with one support point in the middle so the span becomes 1.8 meters, or do I need to reinforce where the wheels stand?
 
Pictures?

I think it holds, if it's a garage there have probably been vehicles there before.
The simplest thing is to lay a two-inch plank across the joists where you will have the wheel pairs if you're worried about the point loads.
 
Is this raised floor directly on the ground? Or is there a type of basement underneath?

I'm mostly thinking about the consequences if the floor now collapses.

A thicker plank across the joists under the wheels, as the previous speaker suggested, probably makes a big difference.
 
The floor is indeed loaded the entire way when it is driven in over the floor.

Or is it not counted when the car is in motion?
Only when it is stationary?
 
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