Glossary & Measure Calculation Methodology

Acronyms

• PT Public Transport
• SH State Highway
• HV Heavy Vehicles
• N2P Ngauranga to Petone
• ToD Time of Day
• DoW Day of Week
• TA Territorial Authority

Highway Traffic Volumes Dashboard

Measures

• Traffic Change / Growth Rate This measure shows how much the average traffic volume of the current year has increased or decreased compared to the selected base year, expressed as a percentage. The formula is:
  • (Current Year Traffic Volume - Base Year Traffic Volume) / Base Year Traffic
• % of Weekday Peak Hour Volume
  • Step 1: Calculate the average weekday peak hour volume over the selected time range. The weekday is defined as the weekday outside of public holidays and school holidays.
  • Step 2: Calculate the average hour volume across the selected time range.
  • Step 3: Calculate the percentage of Weekday Peak Hour Volume, and the formula is: average hour volume / average weekday peak hour volume
• Percentage of Peak Hour Volume by Day of Week and Time of Day
  • Step 1: Calculate the average volume over the selected time range.
  • Step 2: Calculate the maximum average hourly traffic volume, across all hours of the day.
  • Step 3: Calculate the percentage of peak hour volume, and the formula is: average volume / maximum average hourly traffic volume of the day

Public Transport Volumes Dashboard

Dimensions

• WD Weekday (excluding public holidays)
• WE Weekend (including Saturdays, Sundays and public holidays)
• IP Inter-peak
• ON Overnight

Crowding Dashboard

Dimensions

• Capacity Ratio of passengers onboard to seats available
• Crowding level of service Alphabetical scale A-F based on the ratio of pax to seats

 [0,    0.50] 

 (0.5,  0.75] 

 (0.75, 1.00] 

 (1.0,  1.25] 

 (1.25, 1.50] 

 (1.5,  ∞   ] 

• AM Peak 06:00 - 09:00 weekdays
• PM Peak 15:00 - 18:00 weekdays
• Inter-peak 09:00 - 15:00 weekdays
• Overnight 18:00 - 06:00 weekdays

Highway and PT Travel Times Dashboard

Dimensions

• AM Peak 06:00 - 09:00 weekdays
• PM Peak 15:00 - 18:00 weekdays
• Inter-peak 09:00 - 15:00 weekdays
• Overnight 18:00 - 06:00 weekdays

Measures

• Variability (75th percentile travel time - 25th percentile travel time) / (mean travel time). How much variation is there between the fastest and slowest trips for a given time period.
• % of Free Flow Travel time relative to an unimpeded trip time under 'free-flow' conditons. Free-flow conditions are defined as the average 07:00-08:00 travel time on weekends.
• PT / Car Ratio Relativity between PT travel time (or speed) and car travel time (or speed) for a given corridor

Wellington CBD Cordon Dashboard

Dimensions

• AM Peak 06:00 - 09:00 weekdays
• PM Peak 15:00 - 18:00 weekdays
• Inter-peak 09:00 - 15:00 weekdays
• Overnight 18:00 - 06:00 weekdays
• Weekend Day 09:00 - 18:00 weekends
• Weekend Overnight 18:00 - 09:00 weekends

• Site Point location where vehicles are detected (aggregation of one or more detectors)
• Screenline Geographic line where vehicles movenents across (in each direction) are detected (aggregation of one or more sites)
• Cordon Geographic polygon where vehicle movements in and out are detected (aggregation of one or more screenlines)
• NetBI Metlink's electronic ticketing dataset

Measures

• Average Daily Passengers (ADP) Average of passengers onboard by date
• Year-on-year % Change Percentage change from previous year for selected month(s):
  • (ADP - ADP_{prev year})/ADP_{prev year}
• % Change from 2019 Percentage Change from 2019 (base year) for selected month(s):
  • (ADP - ADP₂₀₁₉)/ADP₂₀₁₉
• Bus / Rail Cordon Count – AM Inbound Derived Measure from electronic ticketing data to replicate historic cordon survey counts. Data is the average daily passengers filtered to:
  • 07:00 – 09:00 AM
  • Tuesday – Thursday
  • Inbound towards the CBD