To alleviate traffic congestion and improve freeway operation efficiency, advanced technical means are proposed to avoid congestion. Ramp control is one of the most effective methods to alleviate highway traffic congestion. This paper first describes several widely used management and control technologies and then focuses on the basic control principles, advantages, and disadvantages of the most attractive on-ramp control algorithms, such as local ramp control algorithm, cooperative ramp control algorithm, competitive ramp control algorithm, and integrated ramp control algorithm. Finally, based on summarizing the existing ramp control algorithms, the future research direction of the on-ramp control method is analyzed and prospected.

CICTP