This research uses data from observations of 8,277 motorcyclists at various types of roads of the road hierarchy in Malaysia in 2015, to investigate the effects of road characteristics, motorcyclists’ riding behaviour, motorcyclists’ and motorcycles’ characteristics on the occurrence of riding with excessive speed. For data collection and analysis, new software, MECHROM was developed. The speed analysis shows that motorcyclists go faster than other vehicles along three-lane dual carriageway primary and four-lane dual carriageway collector roads. In general, 42.2% of the observed motorcycles exceed the speed limit while 28.6% of them go beyond the 85th percentile of the traffic speed. 80% of the motorcyclists only ride on the road shoulder on two dual carriageway roads with a paved shoulder, while on roads without a paved shoulder, more than 90% of motorcyclists were observed riding in the slow lane or near the edge of the road. Motorcyclists often ride in front of another vehicle (21.1% - 31.3%) regardless of the type of road. In determining the factors associated with motorcyclists riding with excessive speed, a mixed effect logistic regression model was produced, with three levels statistically significant random effect parameters. The fixed parameter factors are primary road, roads with no shoulder, motorcycles with engine capacity of more than 150 cc, not overloading motorcycle, bright motorcycles, male rider, wear helmet and shoes, riding in the middle of the lane or shoulder, lane splitting and weaving between vehicles. The random parameters show that the majority of variation in the outcomes occurs at Level 1, which is the riders (56.5%), while 12.2% for the type of motorcycle at Level 2, and 31.2% for the locations at Level 3. The variations indicated that the motorcyclist’s characteristics and riding behaviours are still important and there more yet to be identified that are influencing the outcome of riding at excessive speed while the type of motorcycle clearly indicates that motorcyclists may ride with excessive speed regardless of the type of motorcycle.