The Vehicle Emissions Prediction Model (VEPM) is used to predict emission factors for New Zealand fleet vehicles that could be found under typical road, traffic and operating conditions.
VEPMs intended use is for emission estimation at road network level. It is well suited for scenario testing and modelling future developments and road use predictions with a focus on quantifying vehicle emissions and predicting how these are likely to change over time.
VEPM can be used as an input component in conjunction with other models when predicting the effects of proposed infrastructure changes on surrounding areas.
VEPM - Assessment Process
VEPM was developed for Auckland Council (AC) and released for use in 2008 as v3.0 with subsequent updates and refinements since then (at the time of writing version 5.3 is available). The model was developed with the aim of quantifying vehicle emissions with specific focus on New Zealand’s vehicle fleet.
The VEPM model predicts emission species including CO, CO2, VOC (Volatile organic compounds), NOx, NO2, PM2.5 (Exhaust), PM (Brake &Tyre) & FC (fuel consumption) for a variety of input class vehicles and scenario conditions i.e. vehicle size, average speed, fuel type, gradient & load. VEPM also provides the option to calculate brake and tyre wear particulate emissions based on the average number of wheels for each vehicle class.
The VEPM is a password protected Excel spreadsheet which is publically available upon request from the New Zealand Transport Agency (NZTA) (firstname.lastname@example.org); just add “Vehicle Emissions Prediction Model” in the subject line. On the NZTA website full access is available to current model downloads and current user guides.
The VEPM runs on a variety of input data which is added by the user to the work sheet this include both required and optional inputs based on availability;
|Latest Version||VEPM V5.3 (April 2017)|
|State of Development||Released and updated|
|Management Domains||Air Quality|
|Subdomains||Air Emissions Inventories|
|Intended End Users||
|Steady State or Dynamic||Unknown|
|Key Input Data||Average speed for vehicle types, fleet profiles, climatic variables|
|Input Data Formats||XLS(X)|
|Key Output Data||Emissions (CO, CO2, VOC, NOX, NO2, PM)|
|Output Data Formats||XLS(S)|
|Open/Closed Source||Closed Source|
|Licence Type||No Licence|
|Operating Systems||MS Windows|
|Software Needed||MS Excel|
|User Interface||Graphical desktop|
|Ease of Use||Easy|
|Use in Policy Process||Plan (Policy Formulation), Review (Issue Identification)|
See NZTA website - Vehicle emissions prediction model