Motorcycle escorts are key to keeping a funeral procession in good order as mourners make their way from service to cemetery. Some funerals have family and friends coming from out of state and are not familiar with the area of the services. It's all about safety.
Riders are counted out per numbers of cars in the procession; one per 10 is a handy rule of thumb. Among duties are mapping an optimal and safe route, distributing placards to mark cars in the procession, and looking official and respectful, usually through uniforms.
Motorcycle escort riders, who might have served public safety forces such as police or fire, are trained to specifications certified by California Highway Patrol.