The “value of time” according to transport economics refers to the opportunity cost of the time that voyager spend on their journey. In other words, it is the amount that a traveler would be willing to pay in order to save time, or the amount they would accept as compensation for lost time. It’s a known fact that one of the main reasons behind the transport improvements is the amount of time that travelers can save. Using a set of values of time, the economic benefits of a transport project can be quantified to compare with the costs (which form the basis of cost-benefit analysis) (Ben-Akiva and Lerman, 1985). Values of time consist of the calculation of the non-monetary costs incurred as part of a journey, so that the generalized cost of the journey (a combination of both monetary and non-monetary costs) can be calculated.
Although the value of time is an entity which depends upon the purpose of the journey, but can generally is divided into two sets of valuations: working time and non-working time (wiki). Working time is subject to the forces of the labor market, and so can be valued in a relatively straightforward manner. The value of working time is the opportunity cost of that time to the employer, which is generally equivalent to the salary of the worker. For example, if a worker is on a salary of £15 per hour travels to a meeting, the value of time in that case is £15 per hour, because that is the amount the employer would be willing to pay to reduce travel time (as travel time can be considered to be "wasted", i.e. not spent working). According to the UK Department for Transport, calculation is done for the average values of time for travel on various modes of transport so that these values can be used to appraise transport projects. The non-working time ...