Acceleration and braking<\/h2>\n\n\n\n
The Quartix system monitors the speed of a vehicle every second. The system then calculates:<\/p>\n\n\n\n
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- The number of times per hour that the speed changes by more than a given amount between one second and the next;<\/li>\n\n\n\n
- How severe the changes are;<\/li>\n\n\n\n
- How long the vehicle has been driving.<\/li>\n<\/ul>\n\n\n\n
This calculation becomes the acceleration index and the braking index.<\/p>\n\n\n\n
Acceleration index:<\/b> the sum of all the acceleration incidents, each multiplied by their severity and finally divided by the driving time in hours. Calculating it in this way means that no drivers are penalised for driving more or less than any other driver.<\/p>\n\n\n\n
B<\/b>raking index<\/b>:<\/b> the sum of all braking incidents, worked out in a similar way, except that the levels of speed change are slightly different, as are the severity weightings, as excessive braking is considered to be more of a risk factor.<\/p>\n\n\n\n
The speedometer pictured here shows the 10 levels of acceleration and braking, each level has a weighting based on its severity. For example, if the speed increases by 6 mph in a second, that is a level 3 acceleration. If the speed decreases by 9 mph, that is a level 3 braking, and so on.<\/p>\n<\/div>\n<\/div>\n\n\n\n
\n\nCalculating the driver scores<\/h2>\n\n\n\n
To get the driving style score, the Quartix system:<\/p>\n\n\n\n
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- Adds up all the weighted acceleration and braking events;<\/li>\n\n\n\n
- Calculates the total driving time;<\/li>\n\n\n\n
- Works out the acceleration and braking indexes;<\/li>\n\n\n\n
- Averages these and subtracts from 100.<\/li>\n<\/ul>\n\n\n\n
This is the driving style score.<\/p>\n\n\n\n
For example, if you have a driver with an acceleration index of 10 and a braking index of 6, the average for this driver would be 8. This drivers\u2019 driving score would be 100 minus 8, equalling a score of 92.<\/p>\n\n\n\n
Our system calculates the driver score each day based on the amount of driving for that day or shift. We apply colours to the scores, as well, for easy identification.<\/p>\n\n\n\n
GREEN:<\/b> Scores greater than 80, represent the best 30% of drivers<\/p>\n\n\n\n
AMBER:<\/b> Scores of 50-80, represent the middle 50% of scores<\/p>\n\n\n\n
RED:<\/b> 50 and below, represent the worst 20%<\/p>\n<\/div>\n\n\n\n
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What about speed?<\/h2>\n\n\n\n
Quartix recognises that the speed of a vehicle is important and exceeding the speed limit is a major factor in accidents and road incidents. But evaluating driving behaviour by just using the legal speed limit isn\u2019t the best way. Often, the safe speed for a road may be well below the legal limit.<\/p>\n\n\n\n
This is particularly true on rural roads where data shows a surprisingly high rate of fatal accidents despite very few drivers exceeding the legal limit on such roads. With a better picture of the average speed drivers use versus the \u2018legal\u2019 speed, fleet managers can coach drivers on safer driving, potentially saving lives and reducing loss ratios.<\/p>\n\n\n\n
\n\nBy measuring the speed of many thousands of vehicles over a long period, Quartix has designed the SafeSpeed database, made up of actual speeds recorded at several million locations across the country. This means that the speed of any vehicle, at any location can be compared to the speed of other vehicles that have travelled on the same section of road.<\/p>\n\n\n\n
To learn more about the SafeSpeed database, download our free whitepaper<\/a> or watch our video. <\/a><\/p>\n\n\n\n
Quartix provides a Relative Speed Score for each driver and vehicle which uses contextual speed to giver a better picture of the driver\u2019s performance. However, this score is separate from the driving style score.<\/p>\n<\/div>\n\n\n\n
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![\"\"](\"https:\/\/www.quartix.com\/content\/uploads\/2020\/04\/Driver-at-wheel.jpg)
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