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ii A porous pavement is a type of sustainable pavement that allows stormwater to infiltrate through the pavement into the natural soil bed. Rubber modified binder is the combination of regular asphalt binder mixed with ground crumb rubber, which is derived from used rubber tires by shredding or grinding the tires into small fragments. This research investigated the effects of rubber modified binder on the performance properties of porous asphalt mixtures, which include draindown, porosity, permeability, abrasion resistance, moisture susceptibility, and rutting resistance. The addition of cellulose fibers has been used to increase the optimum binder content of porous asphalt mix designs without increasing the binder draindown. The increased optimum binder content (OBC) allows the asphalt binder to create a thicker coating (or stronger bond) between the aggregate particles, creating a more durable and stronger structure. This research focused on replacing the cellulose fibers with rubber modified binder in an effort to increase the OBC of mix designs without increasing th