newell_constrained_timestep Class Reference

Newell (2002) car-following model with a constrained timestep of 1. More...

#include <newell_constrained_timestep.h>

Inheritance diagram for newell_constrained_timestep:

Public Member Functions
	newell_constrained_timestep ()
	Default constructor for the newell_constrained_timestep model.
	newell_constrained_timestep (p_newell *p)
	Constructor with custom parameters for Newell's model.
void	validate_parameters (params *p=nullptr) override
	Validates the model parameters, ensuring the timestep is constrained to 1.
point *	new_point (generalized_trajectory *leader, trajectory *follower, params *p=nullptr) override
	Computes the next point in the follower's trajectory.
Public Member Functions inherited from newell
	newell ()
	Default constructor for Newell's model.
	newell (p_newell *p)
	Constructor for Newell's model with custom parameters.
double	equil_spcg (double vl, double vf, params *p=nullptr) override
	Computes the equilibrium spacing between the leader and follower vehicles.
double	wave_speed (point *leader, point *follower, params *p) override
	Returns the wave speed for Newell's model.
double	free_flow_speed (params *p=nullptr) override
	Returns the free-flow speed for Newell's model.
Public Member Functions inherited from model

Additional Inherited Members
Public Attributes inherited from model
params *	pars
	Parameters for the car-following model.
Protected Member Functions inherited from newell
void	initialize_parameters (p_newell *p)
	Initializes the model parameters for Newell's model.
double	accel (point *leader, point *follower, params *p) override
	Computes the follower vehicle's acceleration based on the leader's position.
point *	new_point (point *leader, point *follower, params *p=nullptr) override
	Computes the next point in the follower's trajectory.
Protected Member Functions inherited from model
Protected Attributes inherited from newell
float	tau
	Time gap (τ) between the trajectories of the follower and the leader.
float	sj
	Jam spacing (δ), the minimum distance between vehicles in a jam.

Detailed Description

Newell (2002) car-following model with a constrained timestep of 1.

This class is a variant of the Newell car-following model, with the only difference being that the timestep is validated and fixed to 1. It inherits all properties and functionalities of the original Newell model.

Constructor & Destructor Documentation

newell_constrained_timestep() [1/2]

newell_constrained_timestep::newell_constrained_timestep

(

)

Default constructor for the newell_constrained_timestep model.

This constructor initializes the model using default parameters for Newell’s car-following model with the timestep constrained to 1.

newell_constrained_timestep() [2/2]

newell_constrained_timestep::newell_constrained_timestep

(

p_newell *

p

)

Constructor with custom parameters for Newell's model.

This constructor allows setting custom values for Newell’s car-following model, with the timestep validation constrained to 1.

Parameters

p	Pointer to the p_newell parameter class containing model parameters.

Member Function Documentation

new_point()

point * newell_constrained_timestep::new_point ( generalized_trajectory * leader, trajectory * follower, params * p = nullptr )

overridevirtual

Computes the next point in the follower's trajectory.

This method calculates the follower’s next position and velocity based on the constrained timestep model.

Parameters

leader	Generalized trajectory of the leader vehicle.
follower	Trajectory of the follower vehicle.
p	Parameters for Newell's car-following model.

Returns

A point representing the follower's updated position and speed.

Reimplemented from newell.

validate_parameters()

void newell_constrained_timestep::validate_parameters ( params * p = nullptr )

overridevirtual

Validates the model parameters, ensuring the timestep is constrained to 1.

This method ensures that the timestep of the model adheres to the fixed value of 1. If any parameter violates this condition, an exception is raised.

Parameters

p	Pointer to the params class containing model parameters.

Reimplemented from model.

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

• include/newell_constrained_timestep.h