Value of travel time saved by commuters has been determined as a function of their level of income and amount of time saved. An difference curve for alternative trip costs and saved is established indirectly from a choice between two routes, one being atoll route. A probability function is derived, and the curve for the variable value of time saved against amount of time saved shows an S-shape, at a given income level. The marginal value of time appears to increase as the time saved goes up to approximately 15 minutes, there-after decreases. The result of the investigation is a large drop in the value of time calculation at a constant level of value for traffic analyses, compared with the calculation at a constant level of value for time in earlier studies.
Samenvatting