p_gipps Class Reference

Parameter class for the Gipps car-following model. More...

#include <p_gipps.h>

Inheritance diagram for p_gipps:

Public Member Functions
	p_gipps ()
	Default constructor for p_gipps.
	p_gipps (double an, double bn, double sn, double vn, double tau, double bg)
	Constructor with custom parameter values.
Public Member Functions inherited from params
	params ()
	Default constructor for the params class.

Public Attributes
double	an = 1.7
	Maximum acceleration in m/s².
double	bn = -3.4
	Maximum deceleration (braking) in m/s².
double	sn = 6.5
	Jam spacing in meters (the minimum safe distance between stopped vehicles).
double	vn = 120.0 / 3.6
	Free-flow speed in m/s (default value: 120 km/h).
double	tau = 0.8
	Driver's reaction time in seconds.
double	bg = -3.2
	Estimated maximum deceleration of the leader in m/s².

Detailed Description

Parameter class for the Gipps car-following model.

This class stores the parameters required for simulating vehicle behavior in the Gipps car-following model. The parameters represent key driver behaviors and vehicle constraints, such as:

• an: Maximum acceleration that the driver is willing to undertake.
• bn: Maximum deceleration (braking) that the driver considers safe.
• sn: Jam spacing, the minimum distance the driver maintains when the vehicle is stopped.
• vn: Free-flow speed, the desired speed when no vehicles are ahead.
• tau: Reaction time, the time it takes for the driver to respond to the vehicle ahead.
• bg: Leader's estimated maximum deceleration, used to predict the worst-case scenario for sudden braking.

These parameters are essential for reproducing realistic traffic behavior in simulations, such as maintaining safe following distances and appropriate speed adjustments in response to changing traffic conditions.

Reference: Gipps, P.G. (1981), "A Behavioural Car-Following Model for Computer Simulation", Transport Research Part B, Vol. 15, pp. 105-111.

Constructor & Destructor Documentation

p_gipps() [1/2]

p_gipps::p_gipps

(

)

Default constructor for p_gipps.

Initializes the parameters with default values based on general traffic conditions: an = 1.7 m/s² (maximum acceleration), bn = -3.4 m/s² (maximum deceleration), sn = 6.5 meters (jam spacing), vn = 120 km/h (free-flow speed), tau = 0.8 seconds (reaction time), bg = -3.2 m/s² (leader's estimated maximum deceleration).

p_gipps() [2/2]

p_gipps::p_gipps	(	double	an,
		double	bn,
		double	sn,
		double	vn,
		double	tau,
		double	bg )

Constructor with custom parameter values.

This constructor allows initializing the parameters with custom values, allowing for specific scenarios to be modeled. These parameters correspond directly to driver and vehicle behaviors.

Parameters

an	Maximum acceleration in m/s².
bn	Maximum deceleration (braking) in m/s².
sn	Jam spacing in meters.
vn	Free-flow speed in m/s.
tau	Reaction time in seconds.
bg	Leader's estimated maximum deceleration in m/s².

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The documentation for this class was generated from the following file:

• include/p_gipps.h