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GraphHopper is a fast and memory efficient Java road routing engine working seamlessly with OpenStreetMap data.

There is a newer version: 10.0

package com.graphhopper.routing.ev;

/**
 * Defines the degree of restriction for the transport of hazardous goods through tunnels.

 * If not tagged it will be {@link #A}
 *
 * @see Hazmat Tunnel restrictions
 */
public enum HazmatTunnel {
    /**
     * driving with any dangerous goods allowed
     */
    A,
    /**
     * no goods with very large explosion range
     */
    B,
    /**
     * no goods with large explosion or poisoning range
     */
    C,
    /**
     * no goods which threaten a large explosion, poisoning or fire
     */
    D,
    /**
     * forbids all dangerous goods except: UN 2919,3291, 3331, 3359, 3373
     */
    E;

    public static final String KEY = "hazmat_tunnel";

    public static EnumEncodedValue create() {
        return new EnumEncodedValue<>(KEY, HazmatTunnel.class);
    }

    // for backward compatibility: no custom toString()
}