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Construction sites typically involve a risky, dynamic, and challenging work environment. Despite numerous safety training programs and regulations, accidents still occur in construction sites, especially when working with construction robotics. To alleviate this problem in the most fundamental way, teleoperation that allows operators to work remotely has been studied. Teleoperated construction robots have the great potential to be used in various contexts for extreme and hazardous construction sites. Here, work conditions for human-robot interaction in construction differ from those in other structured and controlled environments like manufacturing factories, and thus there is a need for the associated studies. In this paper, we aim to measure and analyze the performance of human-robot interaction and the cognitive load of human operators in dynamic and challenging construction work environments (hazardous risks such as underground utility strikes and working under time constraints). 

With the advancement of automation and robotic technologies, the teleoperation has been leveraged as a promising solution for human workers in a hazardous construction work environment. Since human operators and construction sites are separated in a distance, teleoperation requires a seamless human-machine interface, an intermediate medium, to communicate between humans and machines in construction sites. Several types of teleoperation interfaces including conventional joysticks, haptic devices, graphic user interfaces, auditory interfaces, and tactile interfaces have been developed to control and command construction robotics remotely. The ultimate goal of human-machine interfaces for remote operations is to make intuitive sensory channels that can provide and receive enough information while reducing the associated cognitive and physical load on human operators. Previously developed interfaces have tried to achieve such goals, but each interface still has challenges that should be assessed for enhancing the future teleoperation application in construction workplaces. This paper examines different human-machine interfaces for excavator teleoperation in terms of its on-site usability and intuitiveness. The capabilities of the interfaces for excavator teleoperation are evaluated based on their limitations and requirements. The outcome is expected to provide better understanding of teleoperation interfaces for excavators and guiding future directions for addressing underlying challenges.