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1   package org.opentrafficsim.road.gtu.lane.perception.mental;
2   
3   import static org.opentrafficsim.base.parameters.constraint.NumericConstraint.POSITIVEZERO;
4   
5   import org.opentrafficsim.base.parameters.ParameterException;
6   import org.opentrafficsim.base.parameters.ParameterTypeDouble;
7   import org.opentrafficsim.base.parameters.ParameterTypes;
8   import org.opentrafficsim.base.parameters.Parameters;
9   import org.opentrafficsim.road.gtu.lane.perception.mental.Fuller.BehavioralAdaptation;
10  
11  /**
12   * Behavioral adaptation which reduces the desired speed to reduce task-demand.
13   * <p>
14   * Copyright (c) 2013-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
15   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
16   * </p>
17   * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
18   * @author <a href="https://tudelft.nl/staff/p.knoppers-1">Peter Knoppers</a>
19   * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
20   */
21  public class AdaptationSpeed implements BehavioralAdaptation
22  {
23  
24      /** Parameter for desired speed scaling. */
25      public static final ParameterTypeDouble BETA_V0 =
26              new ParameterTypeDouble("Beta_v0", "max desired speed scaling", 1.0, POSITIVEZERO);
27  
28      /** Base value for the desired speed. */
29      private Double fSpeed0;
30  
31      /** {@inheritDoc} */
32      @Override
33      public void adapt(final Parameters parameters, final double taskSaturation) throws ParameterException
34      {
35          if (this.fSpeed0 == null)
36          {
37              this.fSpeed0 = parameters.getParameter(ParameterTypes.FSPEED);
38          }
39          double eps = parameters.getParameter(Fuller.TS) - parameters.getParameter(Fuller.TS_CRIT);
40          eps = eps < 0.0 ? 0.0 : (eps > 1.0 ? 1.0 : eps);
41          double factor = 1.0 - parameters.getParameter(BETA_V0) * eps;
42          parameters.setParameter(ParameterTypes.FSPEED, this.fSpeed0 * factor);
43      }
44  
45  }