Travel Time Improvements
In this worksheet the user can evaluate the impact of strategies affecting modal travel time. Figure 7 shows that the model differentiates between access and travel time, thus allowing the user to assess the impact of strategies that affect the two most relevant components of travel time.
The model allows the evaluation of a single policy or the simultaneous assessment of a portfolio of strategies representing a mix of “sticks” and “carrots” to understand how policies are interlinked. Sensitivity analysis of the sketch-planning model showed that the final impact of the value of a trip removed is dependent upon the following assumptions:
Program size and characteristics (employee initial modal split);
Policy being evaluated (single policy vs. a package of incentives and
Mix of financial incentives and travel time improvements.
In particular, the value of a trip removed is relatively sensitive to a policy affecting the cost of parking. The impact is relatively greater if additional policies are considered, such as applying a subsidy and a travel time improvement on transit services.
Figure 7 TRIMMS – Travel Time Improvements Worksheet
Soft Program Impacts In this worksheet, the user can evaluate the following initiatives: