Building a 1.8m x 2.9m mezzanine level in garage for storage. Can't support in the middle of the structure. How to do so it's safe?

[Geoff]

The level will be used for storing garden tools, lawnmower,some paper records (1 medium archive box) garden hose & reel,various tools such as drill & drill bits, hand saws & various small tools.

I can't support the centre of the floor because I still want to park my car in the garage.

I currently have timber which is :- support posts every mtr (90 centimeters x 90 centimeters) Softwood rafters (145 mls x 45 mls) The floor will be yellow tounge flooring ( veneered chipboard 19 ml thick)

Should these be strong enough to support? the above mentioned items for storage?

[Anonymous]

Those will probably be adequate, if used properly. Just space the joists a good bit closer to each other or glue and screw them together to have double joists at a regular spacing. Then, there should be no concern and no need for any center support.