This paper investigates the behaviour of a full-scale slab-on-girder reinforced concrete (RC) bridge deck with two different types of internal reinforcement subjected to cyclic rolling loads. The overall dimensions of the deck were 15.24 m x 3.89 m x 0.21 m and the girder spacing was 3.05 m. One section of the deck had top and bottom grids of glass fibre reinforced polymer (GFRP) reinforcement and another had top and bottom grids of steel reinforcement, both designed according to the Canadian Highway Bridge Design Code (CHBDC). In this ongoing study, the bridge deck was subjected to cyclic loading using a novel Rolling Load Simulator (ROLLS) and the paper reports on the cycles completed to date, up to 3000 loading cycles. The stiffness degradation behaviour of the two different deck sections was monitored throughout the testing program using monotonic load tests at different cycling intervals. After 3000 stress loading cycles, the stiffness of the GFRP-reinforced and steel-reinforced sections was reduced by 35% and 28%, respectively. The GFRP-reinforced section experienced greater deflections and a larger decrease in flexural stiffness. The average maximum transverse reinforcement strain in the steel rebar under service load was 29% of yield strain while the GFRP bars were at 3.6% of their ultimate strain. The bridge deck will continue to be loaded up to 3M cycles to establish the fatigue performance of the two sections with different reinforcing materials.