Evaluation of the Effect of Access Point Density on the Safety of Primary Roads. A Case Study


  • Ashar Ahmed Department of Urban and Infrastructure Engineering, NED University of Engineering and Technology, Karachi, Pakistan
  • Md. Kamrul Islam Department of Civil and Environmental Engineering, College of Engineering, King Faisal University, Al-Ahsa, Saudi Arabia
  • Ahmad Farhan Mohd Sadullah Universiti Putra Malaysia, Malaysia
  • Uneb Gazder Department of Civil Engineering, College of Engineering, University of Bahrain, Bahrain
Volume: 14 | Issue: 2 | Pages: 13283-13289 | April 2024 | https://doi.org/10.48084/etasr.6905


This paper investigates the nuanced exploration of access point density's influence on accident frequency, specifically focusing on primary roads in Malaysia. The analysis is multifaceted, considering geographic variations, land use patterns, and the density of access points per km. This investigation scrutinizes the direct relationship between the number of access points per km and the corresponding accident frequency. A critical threshold value for access point density is identified, revealing its consequential impact on average accident frequency. The observed direct proportionality between access point density and accident frequency is a pivotal discovery. Moreover, the role of land use parameters emerges as a key determinant in understanding how accident frequency varies with access point density, particularly on specific road types. This establishes eight access points per km as a potential threshold value for ensuring optimal access point density within a road network. In summary, this study provides insights into the intricate dynamics of access point density and its consequential impact on road safety. The identified threshold value and the recognition of the role of land use contribute valuable perspectives for informed decision-making in road network planning and management.


crash frequency, road geometry, land use, unsignalized intersection, access point per kilometer


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M. Williamson and H. Zhou, "A Study of Safety Impacts of Different Types of Driveways and their Density," Procedia - Social and Behavioral Sciences, vol. 138, pp. 576–583, Jul. 2014.

Access Management Manual. Design Division (DES), Texas Department of Transportation, 2011.

Highway Safety Manual. Washington DC, USA: American Association of State and Highway Transportation Officials, 2010.

X. Xu, A. Kouhpanejade, and Ž. Šarić, "Analysis on Influencing Factors Identification of Crash Rates Using Tobit Model with Endogenous Variable," Promet - Traffic&Transportation, vol. 25, no. 3, pp. 217–224, Jun. 2013.

R. Elvik, "A synthesis of studies of access point density as a risk factor for road accidents," Accident Analysis & Prevention, vol. 107, pp. 1–10, Oct. 2017.

"Introduction: Intersection Safety Briefing Sheets," 2004, Available: https://www.academia.edu/5591388/Introduction_Intersection_Safety_Briefing_Sheets.

M. M. Abdul Manan and A. Várhelyi, "Motorcycle fatalities in Malaysia," IATSS Research, vol. 36, no. 1, pp. 30–39, Jul. 2012.

G. Perri and R. Vaiana, "Road Safety Management of Uncontrolled Access Points: Design Criteria and Insights into Risk Factors," Applied Sciences, vol. 12, no. 24, Jan. 2022, Art. no. 12661.

M. Chakraborty and T. J. Gates, "Association between Driveway Land Use and Safety Performance on Rural Highways," Transportation Research Record, vol. 2675, no. 1, pp. 114–124, Jan. 2021.

G. G. Schultz, J. S. Lewis, and T. Boschert, "Safety Impacts of Access Management Techniques in Utah," Transportation Research Record, vol. 1994, no. 1, pp. 35–42, Jan. 2007.

K. C. Mouskos, W. Sun, S. I. Chien, A. Eisdorfer, and T. Qu, "Effect of Midblock Access Points on Traffic Accidents on State Highways in New Jersey," Transportation Research Record, vol. 1665, no. 1, pp. 75–83, Jan. 1999.

G. G. Schultz, K. T. Braley, and T. Boschert, "Relationship between Access Management and Other Physical Roadway Characteristics and Safety," Journal of Transportation Engineering, vol. 136, no. 2, pp. 141–148, Feb. 2010.

X. Yi, "Impact of access density on number of crashes at commercial roadways," M.S. thesis, Oregon State University, Corvallis, OR, USA, 2009.

J. Xu, J. H. Lambert, and C. J. Tucker, "Highway Access Safety Program Evaluation with Uncertain Parameters," Journal of Transportation Engineering, vol. 140, no. 2, Feb. 2014, Art. no. 04013010.

A. Khavandi and S. O. Rezaeeyan, "Investigating the Effect of Access-point density on Traffic Crash on Rural Two-Lane Highways (Case study: Ahar- Tabriz Highway)," Quarterly Journal of Transportation Engineering, vol. 9, no. 4, pp. 619–630, Jun. 2018.

D. M. Priyantha Wedagama, R. N. Bird, and A. V. Metcalfe, "The influence of urban land-use on non-motorised transport casualties," Accident Analysis & Prevention, vol. 38, no. 6, pp. 1049–1057, Nov. 2006.

C. C. Minh, N. Huynh, M. Chowdhury, J. H. Ogle, W. A. Sarasua, and W. J. Davis, "Impact of Minimum Driveway Spacing Policies on Safety Performance: An Integrated Traffic Micro-Simulation and Automated Conflict Analysis," International Journal of Transportation Science and Technology, vol. 3, no. 3, pp. 249–264, Sep. 2014.

"Guidelines for Public Street and Driveway Connections," in Mn/DOT Access Management Manual, Minnesota Department of Transportation, 2008.

A. Ahmed, A. Sadullah, and A. Yahya, "Evaluating the contribution of physical parameters on the safety of unsignalized intersections," Journal of Engineering Science and Technology, vol. 10, no. 5, pp. 654–666, May 2015.

M. M. Abdul Manan, T. Jonsson, and A. Várhelyi, "Development of a safety performance function for motorcycle accident fatalities on Malaysian primary roads," Safety Science, vol. 60, pp. 13–20, Dec. 2013.

S. Cafiso, A. Di Graziano, G. Di Silvestro, G. La Cava, and B. Persaud, "Development of comprehensive accident models for two-lane rural highways using exposure, geometry, consistency and context variables," Accident Analysis & Prevention, vol. 42, no. 4, pp. 1072–1079, Jul. 2010.

B. Huang, Y. Zhang, L. Lu, and J. J. Lu, "A new access density definition and its correlation with crash rates by microscopic traffic simulation method," Accident Analysis & Prevention, vol. 64, pp. 111–122, Mar. 2014.

P. Prajapati and G. Tiwari, "Evaluating Safety of Urban Arterial Roads of Medium Sized Indian City," in Proceedings of the Eastern Asia Society for Transportation Studies, Taipei, Taiwan, Oct. 2013, vol. 9.

M. Ma, X. Yan, M. Abdel-Aty, H. Huang, and X. Wang, "Safety Analysis of Urban Arterials under Mixed-Traffic Patterns in Beijing," Transportation Research Record, vol. 2193, no. 1, pp. 105–115, Jan. 2010.

R. Abdulla, B. Qader, and K. Sdiq, "Traffic Accident Traits and Driver Characteristics Implication on Road Accidents using Descriptive Analysis: A Cross Sectional Study in Sulaymaniyah, Iraq," Engineering, Technology & Applied Science Research, vol. 13, no. 2, pp. 10372–10376, Apr. 2023.

M. Angın and S. I. A. Ali, "Analysis of Factors Affecting Road Traffic Accidents in North Cyprus," Engineering, Technology & Applied Science Research, vol. 11, no. 6, pp. 7938–7943, Dec. 2021.

M. Touahmia, "Identification of Risk Factors Influencing Road Traffic Accidents," Engineering, Technology & Applied Science Research, vol. 8, no. 1, pp. 2417–2421, Feb. 2018.


How to Cite

A. Ahmed, M. K. Islam, A. F. M. Sadullah, and U. Gazder, “Evaluation of the Effect of Access Point Density on the Safety of Primary Roads. A Case Study”, Eng. Technol. Appl. Sci. Res., vol. 14, no. 2, pp. 13283–13289, Apr. 2024.


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