Abstract
A Digital Twin is a digital replica of a living or non-living physical
entity, and this emerging technology attracted extensive attention from
different industries during the past decade. Although a few Digital Twin
studies have been conducted in the transportation domain very recently,
there is no systematic research with a holistic framework connecting
various mobility entities together. In this study, a Mobility Digital
Twin (MDT) framework is developed, which is defined as an Artificial
Intelligence (AI)-based data-driven cloud-edgedevice framework for
mobility services. This MDT consists of three building blocks in the
physical space (namely Human, Vehicle, and Traffic), and their
associated Digital Twins in the digital space. An example cloud-edge
architecture is built with AmazonWeb Services (AWS) to accommodate the
proposed MDT framework and to fulfill its digital functionalities of
storage, modeling, learning, simulation, and prediction. The
effectiveness of the MDT framework is shown through the case study of
three digital building blocks with their key micro-services: the Human
Digital Twin with user management and driver type classification, the
Vehicle Digital Twin with cloud-based Advanced Driver-Assistance Systems
(ADAS), and the Traffic Digital Twin with traffic flow monitoring and
variable speed limit.