Study Details

Study Title: Safety Evaluation of Median U-Turn Crossover-Based Intersections

Authors: Al-Omari et al.

Publication Date: 2020

Abstract: Alternative innovative designs for intersections were defined to enhance traffic operation and safety. Median U-turn (MUT) and restricted crossing U-turn (RCUT) intersections are among the types of alternative intersections that enable drivers to make left turn movements at median U-turn crossovers downstream of the main intersection. Recently, municipalities and transport agencies have tended to implement these types of intersections. However, their effectiveness in crash reduction has not been adequately determined in previous studies. This is because of the limited number of alternative intersections that were considered in these studies. In addition, there was no consideration for the unusual new geometric design of these intersections. In this study, a safety evaluation was conducted while considering the new intersection-related areas at MUT and RCUT intersections to clarify and quantify their effectiveness in crash reduction. This study considered 73 MUT and 12 RCUT intersections. Two types of MUT intersections were considered in this study. Crash modification factors for MUT and RCUT intersections were estimated by using before‚Äďafter and cross-sectional methods. The results indicated that MUT and RCUT intersections are safer than conventional intersections. MUT intersections are effective in reducing total, property damage only (PDO), rear-end, and opposite direction sideswipe crashes, although they significantly increase single-vehicle and non-motorized crashes. RCUT intersections are effective in reducing fatal-and-injury, injury, head-on, and angle crashes. Findings of this research provide clear evaluation for decision makers about the effectiveness of MUT and RCUT intersections in crash reduction.

Study Citation: Al-Omari, M.M.A., M. Abdel-Aty, J. Lee, L. Yue, and A. Abdelrahman. "Safety Evaluation of Median U-Turn Crossover-Based Intersections". Transportation Research Record, Vol. 2674 (7), (2020) pp. 206-218.

Study Report: Download the Study Report Document


CMFs Associated With This Study

Category: Intersection geometry

Countermeasure: Convert intersection to media U-turn (MUT) intersection

CMF CRF(%) Quality Crash Type Crash Severity Roadway Type Area Type
0.633 36.7 5 Stars All All Not specified Urban and suburban
0.7732 22.68 5 Stars All K,A,B,C Not specified Urban and suburban
0.7548 24.52 5 Stars All A,B,C Not specified Urban and suburban
0.5984 5 Stars All O Not specified Urban and suburban
1.38 -38 5 Stars Single vehicle All Not specified Urban and suburban
0.6835 31.65 5 Stars Angle All Not specified Urban and suburban
0.2559 74.41 4 Stars Head on All Not specified Urban and suburban
0.1719 82.81 5 Stars Other All Not specified Urban and suburban
0.5258 47.42 5 Stars Rear end All Not specified Urban and suburban
0.3942 60.58 4 Stars Other All Not specified Urban and suburban
0.9361 6.39 3 Stars Other All Not specified Urban and suburban
0.9155 8.45 4 Stars Other All Not specified Urban and suburban
0.2167 78.33 4 Stars Other All Not specified Urban and suburban
2.2432 -124.32 4 Stars Other All Not specified Urban and suburban
0.6508 34.92 5 Stars All All Not specified Urban and suburban
0.7175 28.25 5 Stars All K,A,B,C Not specified Urban and suburban
0.7029 29.71 5 Stars All A,B,C Not specified Urban and suburban
0.6296 37.04 5 Stars All O Not specified Urban and suburban
1.4447 -44.47 5 Stars Single vehicle All Not specified Urban and suburban
0.6108 38.92 5 Stars Angle All Not specified Urban and suburban
0.3342 66.58 4 Stars Head on All Not specified Urban and suburban
0.1788 82.12 5 Stars Other All Not specified Urban and suburban
0.5158 48.42 5 Stars Rear end All Not specified Urban and suburban
0.394 60.6 4 Stars Other All Not specified Urban and suburban
1.2337 -23.37 3 Stars Other All Not specified Urban and suburban
1.1316 -13.16 4 Stars Other All Not specified Urban and suburban
0.1269 87.31 4 Stars Other All Not specified Urban and suburban
1.9576 -95.76 4 Stars Other All Not specified Urban and suburban

Countermeasure: Convert intersection to restricted crossing U-turn (RCUT) intersection

CMF CRF(%) Quality Crash Type Crash Severity Roadway Type Area Type
0.7632 23.68 2 Stars All All Not specified Urban and suburban
0.5669 43.31 2 Stars All K,A,B,C Not specified Urban and suburban
0.5726 42.74 2 Stars All A,B,C Not specified Urban and suburban
0.8414 15.86 1 Star All O Not specified Urban and suburban
1.3079 -30.79 1 Star Single vehicle All Not specified Urban and suburban
0.5854 41.46 2 Stars Angle All Not specified Urban and suburban
0.0667 93.33 2 Stars Head on All Not specified Urban and suburban
0.7511 24.89 2 Stars Rear end All Not specified Urban and suburban
0.9291 7.09 1 Star Other All Not specified Urban and suburban
0.3299 67.01 2 Stars Other All Not specified Urban and suburban