Trip Distribution

The model used the 2012 Household Travel Survey to calibrate trip lengths for internal and external person trips. Trips were calibrated based on generalized cost trip length frequencies and validated to time and distance trip length frequencies and average trip lengths. The validation results are shown in Figure 1 and Figure 2. Trip lengths by time and distance met the validation targets and aligned closely with observed data.

No observed data was available for internal and external truck calibration. Truck trips were calibrated based on previous model estimation and validated relative to person work and other trip lengths.

Average Trip Length Validation

Code

viewof varSelect = Inputs.select(new Map([['Time', 'Time'],['Distance', 'Dist']]), {value: 'Variable', label: "Variable"})
// viewof varSelect = Inputs.select(new Map([['Generalized Cost','GC'], ['Distance', 'Dist'], ['Time', 'Time']]), {value: 'Variable', label: "Variable"})

viewof purpSelect  = Inputs.select(new Map([['Internal Trip Purposes', 'MainPurposes'], ['External Trip Purposes', 'Externals']]), {value: 'PurpType', label: "Purpose Set"});

Code

dataLT = transpose(dataStats)
filtered_data = dataLT.filter(function(dataL) {
    return varSelect == dataL.Variable &&
           purpSelect == dataL.PurpType;
})

Code

import {Legend, Swatches} from "@d3/color-legend"
import {howto, altplot} from "@d3/example-components"

Plot

Code

Plot.plot({
  y: {
    axis: null
  },
  x: {
    tickFormat: "s", 
    grid: true
  },
  color: {
    domain: ["Model", "Observed"],
    range: ["#376092", "#77933c"], 
    legend: true
  },
  facet: {
    data: filtered_data, 
    y: "Purpose",
    label: null,
    marginLeft:95
  },
  style: {
    fontSize: 16
  },
  marginTop: 10,
  marginBottom: 60,
  marginRight: 60,
  marginLeft: 95,
  height:750,
  marks: [
    Plot.barX(filtered_data, {
      y: "DataSource",
      x: "AVG_TRIP_LEN",
      fill: "DataSource",
      fx: "DataSource"
    }),
    Plot.ruleX([0])
  ]
})

Figure 1: Average Trip Length

Table

Code

Inputs.table(filtered_data)

Trip Length Frequency Validation

Code

optionsTripPurp = 
[
    ['Home-Based Work'                   , 'HBW'    ],
    ['Home-Based Shopping'               , 'HBShp'  ],
    ['Home-Based Other'                  , 'HBOth'  ],
    ['Home-Based School - Primary'       , 'HBSchPr'],
    ['Home-Based School - Secondary'     , 'HBSchSc'],
    ['Non-Home-Based Work'               , 'NHBW'   ],
    ['Non-Home-Based Non-Work'           , 'NHBNW'  ],
    ['Light Trucks'                      , 'LT'     ],
    ['Medium Trucks'                     , 'MD'     ],
    ['Heavy Trucks'                      , 'HV'     ],
    ['Internal-to-External'              , 'IX'     ],
    ['External-to-Internal'              , 'XI'     ]
]

viewof vTripPurp = Inputs.select(new Map(optionsTripPurp), {value: 'HBW', label: "Trip Purpose:"})

viewof vTlfType = Inputs.select(new Map([['Time','Time'], ['Distance','Dist']]), {value: 'Time', label: "Variable:"})

Code

freqT = transpose(freq)

freqT_filtered_Obs = freqT.filter(function(freqData) {
    return vTripPurp == freqData.TRIPPURP &&
    vTlfType == freqData.TLFTYPE &&
    'freqObs' == freqData.freqSource;
})

freqT_filtered_Mod = freqT.filter(function(freqData) {
    return vTripPurp == freqData.TRIPPURP &&
    vTlfType == freqData.TLFTYPE &&
    'freqMod' == freqData.freqSource;
})

Code

colorScale = d3.scaleOrdinal()
  .domain(["Model", "Observed"])
  .range(["#376092", "#77933c"]);
key2 = Legend(colorScale, {title: "Data Source"})

Code

dataX = transpose(xvals)
filtered_x = dataX.filter(function(dx) {
    return vTripPurp == dx.Purpose &&
           vTlfType == dx.TLF;
})

maxXValue = Math.max(...filtered_x.map(function(dx){ 
    return dx.xValue;
}));

Code

Plot.plot({
  grid: true,
  aspectRatio: 0.5,
  x: {label: 'Distance/Time/Cost', tickFormat: d => d,domain: [0, maxXValue] },
  y: {label: 'Frequency', tickFormat: f => `${Math.round(f * 100)}%`},
  marginRight: 60,
  marginLeft: 60,
  style: {
    fontSize: 15
  },
  marginTop: 60,
  marginBottom: 60,
  marks: [
    Plot.line(
      freqT_filtered_Mod, {x: 'BIN', y: 'freq', stroke: "#376092", strokeWidth: 4}),
    Plot.line(
      freqT_filtered_Obs, {x: 'BIN', y: 'freq', stroke:  "#77933c", strokeWidth: 4}),
    Plot.frame({strokeOpacity: 0.2}),
    ]
});

Figure 2: Trip Length Frequency - Beginning