In an effort to overcome congestion on roads, it is necessary to carry out traffic engineering, one of which is by changing the traffic lane from two directions to one direction. One of them is on Jalan Arif Rahman Hakim, Depok city, which is a two-way (4/2D) road that experiences congestion during rush hours, and to overcome congestion, traffic flow is changed to one direction (2/1), where at two-way system and one-way system have an effect on traffic performance. Data retrieval through questionnaires with data collection tools using google form, all data results were analyzed using multiple linear regression using IBM SPSS version 22. From data analysis, it was found that the factors that affect traffic performance in a two-way system are vehicle situations, obstacles on the other hand, the road situation has a negative effect on traffic performance, where on the one-level service line (C) and on the two-level service line (C). In the one-way system, the vehicle situation, side barriers have a negative effect and the road situation has a positive influence on traffic performance where in the first lane of service level (C), and in the second lane of service level (B). While the most dominant factors influencing traffic performance in a two-way system are side barriers and road situation, in a one-way system are side barriers Keywords: Congestion, Traffic engineering, Two-way system, One-way system, Traffic performance.

<p>Depok City has traffic movement characteristics that are no different from other cities. Traffic movements in Depok City are quite busy and even tend to be congested at certain hours, such as when people go to work and return from work as happened on Arif Rahman Hakim Road which is a 4/2D road type (4 lanes 2 divided directions) which often experiences traffic jams. Efforts to overcome traffic jams are by implementing a system change from 4/2 to 2/1 (two lanes one way) which is expected to improve traffic performance. Observing this phenomenon, this study intends to determine the effect of implementing a one-way system on traffic performance. The findings in the field show that the application of a one-way system can improve traffic performance with an increase in the level of road service in one lane. The results of multiple regression analysis using vehicle situation, side barriers, and road situations simultaneously have a significant effect on traffic performance with an effect value of 10.3%.</p>