The Cooperative Adaptive Cruise Control (CACC) system is beneficial to the traffic flow stability. However, CACC mode will degrade ACC if a vehicle following right behind manual vehicle. This paper presents framework for analytical studies on stability of CACC-manual heterogeneous flow. and car-following models validated by PATH program are used as surrogate degraded vehicles respectively. Intelligent Driver Model (IDM) driven model. investigated theoretically under various market...

In the future, road traffic will incorporate a random mix of manual vehicles and cooperative adaptive cruise control (CACC) vehicles, where CACC vehicle degrade to an (ACC) when vehicle-to-vehicle communications are not available. This paper proposes generalized framework Lighthill-Whitham-Richards (LWR) model for such mixed vehicular flow under different penetration rates. this approach, kinematic wave speed propagating through platoon was theoretically proven be slope fundamental diagram....

Obtaining an optimal stability condition is very important to benefit traffic flow operations for a mix of connected and automated vehicles (CAVs) regular vehicles. In view multiple spatial anticipations CAV car-following models, this paper presents analysis method mixed from the perspective uniform local platoon. Transfer function theory was used derive criterion platoon, based on which chart equilibrium speeds feedback coefficients calculated. Numerical simulations were also performed...

Understanding the string stability of connected and autonomous (CA) vehicles is important for evaluating dynamics regular-CA mixed vehicular flow. Although previous studies proposed CA car-following models analysed model itself, they do not focus on Additionally, analysis methods traditional car-truck flow cannot be directly applied into traffic systems, where vehicle monitors multiple preceding in platoon. This study presents a framework that analytically derives generalized criterion...

String stability is important for understanding traffic flow dynamics, while its analytical study mixed deficient. We focus on an framework string of consisting cooperative adaptive cruise control (CACC), (ACC), and human vehicles. The was conducted based generalized car-following model formulations the three vehicular types. Then criterions one-class flow, local CACC/ACC platoons were derived. Taking into account with partial degenerations CACC concrete models, example application studied....

Previous studies have shown that cooperative adaptive cruise control (CACC) vehicles capability to improve traffic flow stability and reduce emissions fuel consumption. However, previous did not investigate the relevance between these two aspects. To address this issue, we calculated conditions of using car-following models. Simulations are also performed evaluate reductions consumption under oscillations. We compared results for exploring intrinsic them. Results show could qualitatively...

This paper focuses on traffic scenarios randomly mixed with cooperative adaptive cruise control (CACC) vehicles and manual vehicle-to-vehicle (V2V) communication. The analytical investigation of string stability such flow is conducted under different CACC penetration rates. parametric sensitivity analysis desired time-gap also studied. Moreover, numerical simulation both open periodic boundary conditions. Research results indicate that increase helpful for improving the stability. will be...

On highways, it is commonplace to observe car-following behavior among vehicles. Unfortunately, this results in significant particulate matter (PM) emissions, which greatly contribute environmental pollution. Additionally, adverse weather conditions such as rain can negatively affect vehicles’ and have further influences on their PM emissions. The technology of connected automated vehicles (CAVs) offers a promising solution for mitigating these negative influences. This paper investigates...

The cell transmission model (CTM) is important for solving macroscopic traffic problems. Although some studies have been conducted multiclass CTM, a simplified CTM flow mixed with connected and autonomous vehicles (CAVs) still needed. This paper extends the homogenous to form under different CAV market penetration rates. To deal this, triangular fundamental diagram derived proportions of various vehicle types. maximum capacity backward wave speed are described by class proportions. Based on...

The influence of (cooperative) adaptive cruise control (CACC/ACC) on rear-end crashes have been conducted by some previous studies. However, they usually did not consider the degeneration from stable CACC to unstable ACC when vehicle-to-vehicle (V2V) communication is available. California PATH program validated instability system using real experimental data, which might negative impacts safety. Therefore, this paper evaluated vehicles crash risks. A micro-simulation based method was adopted...

This paper is aimed at building a framework for string stability analysis of traffic flow mixed with different cooperative adaptive cruise control (CACC) market penetration rates. In addition to the stability, fundamental diagram also taken into consideration evaluating effect CACC vehicles on capacity. order describe car-following dynamics real vehicles, model proposed by PATH employed, which validated experimental data. The intelligent driver (IDM) used as surrogate traditional manual...

Objective: Connected and automated vehicles (CAV) can monitor multiple ahead via vehicle-to-vehicle (V2V) communication. Although feedback information from more may be helpful for anticipations, it also makes control complex increases the probability of data packet loss. Then needs an appropriate number CAV links, maximum not suitable. Therefore, this article focuses on influence links rear-end collision risks.Methods: To deal with this, stability analysis a car-following model was conducted...

To enhance safety and traffic efficiency, stability of a mixed human connected cruise control (CCC) system is studied. The authors consider individual vehicle platoons, in which the tail CCC receives feedback from multiple human‐driven vehicles ahead via vehicle‐to‐vehicle communications, with objective analysis design. deal this, transfer function theory used. Simulations are also performed to evaluate impacts on efficiency. Results show that output bounds coefficients can be appropriately...

String stability analysis is one of key factors to understanding traffic flow dynamics. Cooperative adaptive cruise control (CACC) vehicles are desired enhance vehicular by monitoring multiple vehicles. From the perspective mixed traffic, this study proposes a generalized method for CACC feedback gains achieve stable flow. To deal with this, random divided into general small platoons, in which tail monitors ahead. These platoons different lengths defined as connected systems. Based on...

Cooperative adaptive cruise control (CACC) vehicles need vehicle-to-vehicle (V2 V) communication to achieve CACC function. When a vehicle follows manual-driven (MDV) without V2 V communication, it needs degenerate (ACC). By using real experiments, California PATH program indicated that ACC are apt be unstable, which may have negative influence on fuel consumption and traffic emissions. Hence, this paper studies the impacts of mixed CACC-MDV emissions, by taking into consideration partial...