FAQ about GMPS

The surface-mounted type is used for temporary installation in demonstration tests that require eventual restoration to the original condition.
The buried type is used in situations where it is expected to be used permanently and the route will not be changed.

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In the initial demonstration experiments, most installations were at 2-meter intervals.
This was to ensure that there was always at least one marker under the vehicle, and to have the advantage of being able to detect the vehicle's front and rear positions at the same time and to know the vehicle's turning angle if two magnetic sensor modules were installed on the vehicle side at 2-meter intervals. Recently, in accordance with the control needs of the vehicle side, we have also had experience with 10 m intervals, etc. in straight, high-speed running sections.

The magnetic force of magnetic markers is considered semi-permanent. When markers are properly selected and constructed for the road, there is no need to replace them.

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Neither water nor ice is physically affected by magnetism. Therefore, the performance of magnetic markers is invariant. If there is enough snow on the ground to allow vehicles to travel, magnetic markers will function with no problems at all.

Although magnetism is unaffected, RFID readout uses radio waves, so there are cases where RFID readout becomes difficult after a specific amount of submersion in water. For this reason, the system is designed so that RFID is not expected to be read out in its entirety.

If magnetic materials such as iron cover the entire upper surface of the magnetic marker, the generated magnetic field will be disturbed. However, if there is an iron structure below the magnetic marker, the generated magnetic field will not be affected significantly. If there is a manhole on the runway, there is no problem if the marker is placed 10 cm away from the manhole.

As a countermeasure, instead of only detecting the position by a single magnetic marker, the system can check the newly detected value while predicting the coordinates of the next marker to be detected based on the most recent multiple magnetic marker detection history (e.g., the past 100 data). If an abnormal position is detected, the data can be ignored, and if it continues, the vehicle can be stopped.

In 2020, the Japanese Road Act was revised to position "Facilities to assist autonomous driving (Magnetic Markers, etc.) as a fixture to roads (in the case of private businesses, a road occupying structure)" under the provision of "Maintenance of Facilities that Assist Autonomous Driving in the Road Space."

Usually, work is required to check the magnetic field noise and other factors at the potential mounting location of the vehicle to confirm that a magnetic marker signal can be obtained. It is also necessary to obtain the vehicle speed pulse signal from the vehicle side and input it to the sensor module.

We have confirmed that even when magnetic markers are mixed in, the same property values as those of ordinary recycled aggregate and recycled asphalt mixtures can be obtained.

We have experience in burying in roads within motorways and expressway facilities (SA, PA).