Intelligent Technologies Initiative Act of 2015 This bill directs the Department of Transportation (DOT) to establish an Intelligent Technology Initiative to provide grants to up to six state and local governments to establish deployment sites for large scale installation and operation of intelligent transportation systems (ITS) to improve safety, efficiency, system performance, and return on investment. DOT shall develop criteria for selecting grant recipients, including how the deployment of technology will enable the recipient to: reduce costs and improve return on investments; deliver environmental benefits and reduce energy consumption by alleviating congestion and streamlining traffic flow; measure and improve the operational performance of its transportation network; reduce the number and severity of traffic collisions and increase driver, passenger, and pedestrian safety; collect, disseminate, and utilize real-time traffic, transit, parking, and other transportation-related information to improve mobility, reduce congestion, and provide for more efficient and accessible transportation alternatives; monitor transportation assets to improve infrastructure management, reduce maintenance costs, prioritize investment decisions, and ensure a state of good repair; and deliver economic benefits by reducing delays, improving system performance, and providing for the efficient and reliable movement of goods and services. A grant application must include: a plan to deploy and provide for the long-term operation and maintenance of ITS to improve safety, efficiency, system performance, and return on investment; quantifiable system performance improvements; quantifiable safety, mobility, and environmental benefit projections; a plan for partnering with the private sector, public agencies, research institutions, organizations representing transportation and technology leaders, and other transportation stakeholders; a plan to leverage and optimize existing local and regional ITS investments; and a plan to ensure interoperability of deployed technologies with other tolling, traffic management, and ITS. Recipient may use grant funds to deploy, operate, and maintain specified ITS and ITS-enabled operational strategies. The bill requires DOT to report on the effectiveness of grant recipients in meeting their projected deployment plans.