As remote operation systems may be extremely diverse and multifaceted, there is no specific number of vehicles. The maximum number of vehicles is influenced by a plethora of factors including the performance of the automation system, the operator task, the operator state, and the design of the human-machine interface.
Interdependencies exist between these factors that impact the vehicle limit. (Schrank et al., 2024), (Aramrattana et al., 2024).