Abstract
In-vehicle information systems become more convenient by various functions. But those systems increase driver
distraction and causes careless driving. With these situations as a background, development of in-vehicle information
systems that limit user operation and presentations of information by driver workload have been extensively studied.
In this paper, we reported a workload estimation method for drivers that breaks down a series of driving operations
into its each operation and quantifies the workload by the VACP method. Results of evaluation experiments by
NASA-TLX show that the proposed method is worth to estimate driver workload.
