The Age Limit for Motorcyclists to Stop Riding in an Effort to Improve Rider Safety

The purpose of this study is to develop a model that can predict when motorcyclists should stop riding due to a decline in alertness, which occurs as the rider ages, resulting in a decreased ability to ride safely. In Indonesia, the number of accidents in 2020 was notably high among individuals aged 10-29 years. This accident rate then decreases until the age of 49, but increases again for those aged 50 years and above. The number of motorcycles in Indonesia continues to grow each year, contributing to the increasing number of accident cases annually. This study was conducted in Riau province, Indonesia, with a total of 860 respondents. Data collection was carried out through interviews. Since the data in this study is probabilistic, it is suitable for analysis using a Bayesian network. The results show that elderly motorcyclists are likely to have a high level of alertness at 57%, adult motorcyclists at 68%, and adolescent motorcyclists at 75%. In scenario 1, elderly motorcyclists whose vision is obstructed while riding are likely to have a high level of alertness at 47%. In scenario 2, elderly motorcyclists riding on roads with roadside variability are likely to have a high level of alertness at 57%. In scenario 3, elderly motorcyclists riding in a fatigued condition are likely to have a high level of alertness at 56%. In scenario 4, elderly motorcyclists riding on pothole-ridden roads are likely to have a high level of alertness at 57%. The findings of this study indicate that riders aged 46-65 years are highly vulnerable to accidents due to having the lowest level of alertness compared to other age groups. It is recommended that motorcyclists aged 46–65 years stop riding motorcycles