The increase of dynamic loads exerted on the pavement is one of the major causes thatrnshorten the pavement service life. The current pavement design procedure whichrnincorporates static loads in the structural design of pavement makes the situation critical.rnHence, decreased riding quality, discomfort and increased vehicle operating cost thatrninfluences overall transportation costs are seen. Thus, a vehicle loading speed must berngiven attention in dynamic analysis due to its effect on tire-pavement interaction andrnpavement response values.rnIn the study, three-dimensional finite element analysis used to simulate the deformationrnof the pavement surface and sub-grade by different vehicular speeds. ABAQUS softwarernis employed to develop total of five three-dimensional finite element models. Eachrnpavement models represent selected vehicular speeds by considering similar materialrncharacterization, single axle single tire load configuration and necessary boundaryrnconditions. The vehicle speed along the wheel path is simulated by progressive shift ofrnthe tires over the pavement loading area.rnFrom the analysis of the pavement models, it was found that lower speeds have longerrncontact time with flexible pavement than higher speeds. This is due to time of loading isrnthe function of tire imprint length and speed. Also, asphalt concrete behavior asrnviscoelastic material plays an important role. Moreover, the greater static effect ofrnloading makes the reduction in lower speeds is more than higher speeds. Thoughrnincreasing velocities make the dynamic's effects of loading more than static's effect ofrnthat, it cannot higher than load's static's effect at low speeds. Hence, accumulated strainrnincreases with an increase in loading time.rnIn addition, vertical strain and stress distribution increase and decrease linearly along thernwheel path as loading amplitude varies in each step time. As a result, maximum stressrnmagnitude under load center for single axle configuration is higher in 20Km/hr thanrn100Km/hr speed. It is also worthy to mention, load's dynamic effect is less considerablernat the top of subgrade. This is due to deeper position of extracted data and the effect ofrnlayers' weight. Hence when speed increases higher than 60Km/hr, a low decrease inrnstrain magnitude is observed.