Abstract
Intelligent transportation system (ITS) has become a crucial section of transportation and traffic management systems in the past decades. As a result, transportation agencies keep improving the quality of transportation infrastructure management information for accessibility and security of transportation networks. The goal of this paper is to evaluate the impact of two competing risks: “natural deterioration” of ITS devices and hurricane-induced failure of the same components. The major devices employed in the architecture of this paper include closed circuit television (CCTV) cameras, automatic vehicle identification (AVI) systems, dynamic message signals (DMS), wireless communication systems and DMS towers. From the findings, it was evident that as ITS infrastructure devices age, the contribution of Hurricane Category 3 as a competing failure risk is higher and significant compared to the natural deterioration of devices. Hurricane Category 3 failure vs. natural deterioration indicated an average hazard ratio of 1.5 for CCTV, AVI and wireless communications systems and an average hazard ratio of 2.3 for DMS, DMS towers and portable DMS. The proportional hazard ratios of the Hurricane Category 1 compared to the devices was estimated as <0.001 and that of Hurricane Category 2 < 0.5, demonstrating the lesser impact of the Hurricane Categories 1 and 2. It is expedient to envisage and forecast the impact of hurricanes on the failure of wireless communication networks, vehicle detection systems and other message signals, in order to prevent vehicle to infrastructure connection disruption, especially for autonomous and connected vehicle systems.
Highlights
Intelligent transportation systems (ITS) and their associated technologies have been employed for the past decades to improve mobility and accessibility on roadways
This paper has employed the competing risks model to estimate the performance of ITS infrastructures
The product-limit survival estimates and the cumulative incidence functions were used to depict the risks of failure of circuit television (CCTV), automatic vehicle identification (AVI), wireless communication systems and dynamic message signals (DMS) due to natural deteriorations in the presence of hurricane-induced failures of the devices from Hurricane Categories 1, 2 and 3
Summary
Intelligent transportation systems (ITS) and their associated technologies have been employed for the past decades to improve mobility and accessibility on roadways. The United States Department of Transportation (USDOT) and the Federal Highway Administration (FHWA) keep refining standards and engaging in programs to upgrade the overall performance on roadways. Innovative travel time reliability, safety and operational measures on corridors remain critical for effective navigation, trip virtualization, intersection crossing and way-finding purposes. As part of the goal of enhancing the ITS on roadways, highway cameras, weather stations, fiber optic cables, traffic detection systems, dynamic message signs and ethernet conversion of ITS networks are constantly installed, furnished, or replaced to effectively manage incidents and traffic along corridors. Robust and secure networks are introduced on roadways to effectively reduce gaps within the ITS network while managing incidents and traveler information in corridors
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