NCT stands for National Car Test. The NCT is a compulsory vehicle inspection programme in Ireland. The primary aim of this programme which falls under the EU Directive 2014/45, is to improve road safety and enhance environmental protection by reducing harmful vehicles emissions in Ireland.
The Road Safety Authority (RSA) has provided the following information relating to vehicle makes and models tested by the National Car Testing Service in 2016.
The main fields, for example, are summarised as follows:
- "VehicleMake" and "VehicleModel" - these fields detail the vehicles make and model
- "YearOfBirth" - this field details the vehicles year.
- "Total" - this field relates to the total NCT's completed by each car model.
- "PASS" and "PASS%" - these fields relate to the total NCT's that by each car model that were successful.
- "FAIL" and "FAIL%" - these fields relate to the total NCT's that by each car model that were unsuccessful.
- The remaining fields were the different items that the vehicles failed on. Overall this is a broad dataset with a variety of information about the Vehicles which have been tested by the NCT.
The data has been preprocessed and field names are changed to make it more meaningful. The aim of this project was to gain an insight into this data and producing three effective visualisations using Vega-Lite. More information can be found about Vega-Lite here
The visualisations are dynamic. Each component on the graph can be hovered to understand information about what the visualisation is conveying.
To view source code in the Vega-Lite browser, navigate to three dots present in the top-right position of each visualisation. Inside the navigation pane, click on 'Open in Vega Editor'.
Raw Vega Spec can also be viewed by navigating to three-dots and then clicking on 'View Compiled Vega'.
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