This study analysed the impact of roadside features and roadway characteristics on the travel speed of multilane highways. Video photography collected data on traffic count and roadside factors from ten sections. The study used the floating vehicle technique to gather data on speed, pedestrian road crossing, and side walking simultaneously. A regression analysis was performed to examine the correlation between speed and factors related to the roadside. The study found that pedestrian road crossing was the most crucial speed-influencing element on open-access multilane highways, followed by road built-up area and pedestrian side walking, through a multilinear regression analysis. The developed models were validated using predicted and observed speeds. Proper pedestrian crossings, standing facilities, and parking can mitigate the impact of these factors on travel speed. However, the study determined that limiting pedestrian crossing and side walking and preventing built-up areas across the road would increase the efficiency of open-access multilane highways.