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The travelling scenario table can either be created in Excel and then imported in AccessMod (see Section 5.4.1) or manually, created in AccessMod (see Sections 5.5.3, 5.5.4, 0 5.5.2 and 5.5.7). In both cases, the table is composed of the following four columns (see example in the Table below):
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- MOTORIZED: the mode being applied to motorized vehicles when no corrections are being applied on the travelling speed, even if a DEM is used in the analysis.
- WALKING: the mode applied when the population walks. In this case, a slope-based correction is applied to the indicated speed. This correction is based on Tobler’s formula (Tobler, 1993), which basically decreases or increase the effective walking speed depending on the steepness of the slope and this differently for up or down movements.
- BICYCLING: a the mode applied when the population uses bikes. A slope-based correction is applied to the indicated speed. See below for details.
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A graphical representation of this relation is shown in
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Speed correction for the bicycling model
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For the Newton technique, we used a maximum tolerance of 0.05 and maximum 10 iterations. If there is no convergence, the result is set to 0.0 kmhkm/h. A graphical example of the corrected speeds in function of the slope for that particular speed is shown in
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the figure below.
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See https://en.wikipedia.org/wiki/Newton%27s_method for details on this technique. Please read the documentation at http://bikecalculator.com/what.html for a more complete description of the formula implementation. |
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