The Distance Measuring Instrument (DMI) measures ARAN chainage or linear distance travelled. It is the most basic and yet one of the most important measurements made by every ARAN vehicle. The DMI allows a vehicle to move at variable speeds in traffic and collect data safely without data corruption due to speed changes. All data must be accurately referenced to its location on the road and the DMI is an integral tool in carrying out that task.
Download the DMI brochure.
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