Insufficient parking has emerged as a critical global transportation concern, particularly in central business districts, leading to congestion in urban transport networks with significant social, economic, and environmental implications. In Debre Markos city, the demand for taxis and travel is swiftly rising due to population growth. However, existing road facilities are inadequate, reducing road capacity, mobility, and exacerbating traffic congestion. On-street parking, encompassing parking occupancy, double parking, differences in peak hours between restaurant activity and passing traffic, lack of driver discipline, and the reduced maneuverability of older vehicles, all contribute to narrowing the available road width, thus impeding traffic flow. This study aims to bridge this knowledge gap by investigating the traffic congestion caused by on-street parking and its impacts on traffic flow. Study results indicate that on-street parking significantly reduces road capacity by 24.1% due to legal parking activities and an additional 25.89% due to illegal double parking. Removing on-street parking could enhance road capacity by 49.9% and reduce travel time by 36%. Additionally, the model reveals a strong relationship between on-street parking and the delay of vehicle movement toward parking locations, with each increase in parking occupancy decreasing average travel speed by 0.03 km/h. This study emphasizes the necessity for proactive policies to address parking issues and uphold urban street service levels amid increasing traffic demands. Local authorities can use the model as a guide for implementing parking prohibition policies, including utilizing dead-end roads for short-term parking, enhance enforcement of parking regulations, integrate parking management with urban planning, and implementing parking management measures to alleviate congestion.

停车位不足已成为全球交通的一个关键问题，特别是在中央商务区，导致城市交通网络拥堵，产生重大社会、经济和环境影响。在德布雷马科斯市，由于人口增长，对出租车和出行的需求迅速增长。然而，现有道路设施不足，降低了道路通行能力、流动性，加剧了交通拥堵。路内停车，包括停车位占用、并排停车、餐馆活动和过往车辆之间的高峰时间差异、驾驶员缺乏纪律以及老旧车辆的机动性降低，所有这些都会导致可用道路宽度变窄，从而阻碍交通流量。本研究旨在通过调查路边停车造成的交通拥堵及其对交通流量的影响来弥补这一知识差距。研究结果表明，由于合法停车活动，路内停车显着减少了道路容量 24.1%，由于非法并排停车，道路容量又减少了 25.89%。取消路边停车位可将道路通行能力提高 49.9%，并将出行时间减少 36%。此外，该模型还揭示了路边停车与车辆向停车地点移动的延迟之间存在密切关系，停车位占用率每增加，平均行驶速度就会降低 0.03 公里/小时。这项研究强调，在交通需求不断增长的情况下，有必要采取积极主动的政策来解决停车问题并维持城市街道服务水平。 地方当局可以将该模型作为实施禁止停车政策的指南，包括利用死胡同进行短期停车、加强停车法规的执行、将停车管理与城市规划相结合，以及实施停车管理措施以缓解拥堵。