Study Details

Study Title: NCHRP Report 650 - Median Intersection Design for Rural High-Speed Divided Highways

Authors: Maze et al.

Publication Date: 2010

Abstract: This report describes common safety issues at median intersections on rural high-speed divided highways and presents innovative geometric and operational treatments for addressing those issues. Ten case studies illustrate how they have been applied in the field. The report includes recommendations for modifications to the AASHTO "A Policy on Geometric Design of Highways and Streets" (Green Book) and the "Manual on Uniform Traffic Control Devices" (MUTCD).

Study Citation: Maze, T., Hochstein, J., Souleyrette, R., Preston, H., Storm, R., "NCHRP Report 650: Median Intersection Design for Rural High-Speed Divided Highways." Transportation Research Board, Washington D.C., (2010).

Study Report: Download the Study Report Document

CMFs Associated With This Study

Category: Advanced technology and ITS

Countermeasure: Install dynamic advance intersection warning system

CMF	CRF(%)	Quality	Crash Type	Crash Severity	Roadway Type	Area Type
0.3	70		All	All	Principal Arterial Other Freeways and Expressways	Rural

0.38	62		All	K	Principal Arterial Other Freeways and Expressways	Rural

0.3	70		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

0.29	71		All	O	Principal Arterial Other Freeways and Expressways	Rural

0.33	67		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.32	68		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.76	24		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.15	85		Not specified	All	Principal Arterial Other Freeways and Expressways	Rural

0.46	54		All	All	Principal Arterial Other Freeways and Expressways	Rural

0	100		All	K	Principal Arterial Other Freeways and Expressways	Rural

0.89	11		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

0.1	90		All	O	Principal Arterial Other Freeways and Expressways	Rural

0.55	45		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.33	67		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

3.19	-219		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.27	73		Not specified	All	Principal Arterial Other Freeways and Expressways	Rural

Category:Intersection geometry

Countermeasure: Convert four-leg intersection into two three-leg intersections

CMF	CRF(%)	Quality	Crash Type	Crash Severity	Roadway Type	Area Type
0.47	53		All	All	Principal Arterial Other Freeways and Expressways	Rural

0.28	72		All	K,A	Principal Arterial Other Freeways and Expressways	Rural

0.6	40		All	B,O	Principal Arterial Other Freeways and Expressways	Rural

0.6	40		All	All	Principal Arterial Other Freeways and Expressways	Rural

0.57	43		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

1	0		All	K	Principal Arterial Other Freeways and Expressways	Rural

0.75	25		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

0.4	60		All	O	Principal Arterial Other Freeways and Expressways	Rural

0	100		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

2	-100		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.67	33		Not specified	All	Principal Arterial Other Freeways and Expressways	Rural

Countermeasure: Install median acceleration lane

CMF	CRF(%)	Quality	Crash Type	Crash Severity	Roadway Type	Area Type
1.13	-12.5		All	All	Principal Arterial Other Freeways and Expressways	Rural

0.88	12.5		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

1.25	-25		All	O	Principal Arterial Other Freeways and Expressways	Rural

0.9	10		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.61	39		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

1.43	-43		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.4	60		Left turn	All	Principal Arterial Other Freeways and Expressways	Rural

0.5	50		Left turn	All	Principal Arterial Other Freeways and Expressways	Rural

0.44	56		Rear end	All	Principal Arterial Other Freeways and Expressways	Rural

1	0		Sideswipe	All	Principal Arterial Other Freeways and Expressways	Rural

4.67	-367		Not specified	All	Principal Arterial Other Freeways and Expressways	Rural

0.77	23		All	All	Principal Arterial Other Freeways and Expressways	Rural

1.56	-56		All	K	Principal Arterial Other Freeways and Expressways	Rural

0.55	45		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

0.95	5		All	O	Principal Arterial Other Freeways and Expressways	Rural

0.75	25		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.52	48		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.8	20		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

1.17	-17		Left turn	All	Principal Arterial Other Freeways and Expressways	Rural

0.21	79		Rear end	All	Principal Arterial Other Freeways and Expressways	Rural

7	-600		Sideswipe	All	Principal Arterial Other Freeways and Expressways	Rural

1.17	-17		Not specified	All	Principal Arterial Other Freeways and Expressways	Rural

Countermeasure: Install offset right turn lane

CMF	CRF(%)	Quality	Crash Type	Crash Severity	Roadway Type	Area Type
1.02	-2		All	All	Principal Arterial Other Freeways and Expressways	Rural

2.78	-178		All	K	Principal Arterial Other Freeways and Expressways	Rural

0.7	30		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

1.39	-39		All	O	Principal Arterial Other Freeways and Expressways	Rural

0.96	4		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

1.39	-39		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

1.41	-41		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

1.37	-37		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.6	40		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0	100		Left turn	All	Principal Arterial Other Freeways and Expressways	Rural

0.94	6.15		All	All	Principal Arterial Other Freeways and Expressways	Rural

1.41	-41		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

0.47	53		All	O	Principal Arterial Other Freeways and Expressways	Rural

0.31	69		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.47	53		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.47	53		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0	100		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0	100		Left turn	All	Principal Arterial Other Freeways and Expressways	Rural

0	100		Rear end	All	Principal Arterial Other Freeways and Expressways	Rural

3.67	-267		All	All	Principal Arterial Other Freeways and Expressways	Rural

1	0		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

2.93	-193		All	O	Principal Arterial Other Freeways and Expressways	Rural

1.1	-10		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0	100		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

2.2	-120		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

6.6	-560		Rear end	All	Principal Arterial Other Freeways and Expressways	Rural

Countermeasure: Install positive offset left turn lanes

CMF	CRF(%)	Quality	Crash Type	Crash Severity	Roadway Type	Area Type
0.5	50		All	All	Principal Arterial Other Freeways and Expressways	Rural

0.16	84		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

1.57	-57		All	O	Principal Arterial Other Freeways and Expressways	Rural

0.22	78		Left turn,Rear end	All	Principal Arterial Other Freeways and Expressways	Rural

0.37	63		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

2.62	-162		Not specified	All	Principal Arterial Other Freeways and Expressways	Rural

0.67	33		All	All	Principal Arterial Other Freeways and Expressways	Rural

0	100		All	K	Principal Arterial Other Freeways and Expressways	Rural

0.35	65		All	A,B,C	Principal Arterial Other Freeways and Expressways	Rural

1.65	-65		All	O	Principal Arterial Other Freeways and Expressways	Rural

0.24	76		Left turn,Rear end	All	Principal Arterial Other Freeways and Expressways	Rural

1.24	-24		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

0.83	17		Not specified	All	Principal Arterial Other Freeways and Expressways	Rural

Countermeasure: Positive left-turn lane offset (left turn crashes)

CMF	CRF(%)	Quality	Crash Type	Crash Severity	Roadway Type	Area Type
0.15	85		Left turn	All	Principal Arterial Other Freeways and Expressways	Rural

0	100		Left turn	All	Principal Arterial Other Freeways and Expressways	Rural

Category:Signs

Countermeasure: Install improved advance freeway guidance signage

CMF	CRF(%)	Quality	Crash Type	Crash Severity	Roadway Type	Area Type
1.07	-7		All	All	Principal Arterial Other Freeways and Expressways	Rural

0.69	31		Angle	All	Principal Arterial Other Freeways and Expressways	Rural

2	-100		Rear end	All	Principal Arterial Other Freeways and Expressways	Rural

CRASH MODIFICATION FACTORS CLEARINGHOUSE

Study Details

CMFs Associated With This Study

Category: Advanced technology and ITS

Category:Intersection geometry

Category:Signs