the number of intersections along a road corridor and abutting land uses affects operating speed of vehicle along the corridor, with this understanding that speed (design or operating) is an important factor in the computation of road capacity, how can the influence of the road environment be captured?
Although the road environment (e.g. perceived risk) has influence on the speed of the transportation, compared to other factors (speed limit, surface quality, vehicles use the road, traffic signs and lights, hilliness, windiness, weather, direction - disturbing sunshine from the back or front-, road signs, driving culture, seasonality -daily, weekly, by season-, etc.) is negligible and can be two directional. For instance the protective forest bands at roadside give you shelter from sunshine and wind, increase the perceived speed (tunnel effect), results slower drying of the surface, and prevent snow on the road, so they have capacity increasing and decreasing effect depending on the weather, time during the day, season. Your transportation usually have seasonality as well.
Playing children in the close pavement makes you slow down.
I suggest to collect all the attribute influences the road capacity (I think the speed is not even the first in a range), and rank them by using Delphi or other multi-criteria decision making method. You can decide on how the environment affects the capacity based on that ranking.
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