It has been shown that vehicle-to-vehicle and vehicle-to-roadside communications architectures could co-exist in VANETs to provide road safety, navigation, and other roadside services.
[18] Major standardization of VANET protocol stacks is taking place in the U.S., in Europe, and in Japan, corresponding to these regions' dominance in the automotive industry.
In the US, the systems could use a region of the 5.9 GHz band set aside by the United States Congress, the unlicensed frequency also used by Wi-Fi.
Over the years, there have been considerable research and projects in this area, applying VANETs for a variety of applications, ranging from safety to navigation and law enforcement.
As of 2016, V2V is under threat from cable television and other tech firms that want to take away a big chunk of the radio spectrum currently reserved for it and use those frequencies for high-speed internet service.
The Federal Communications Commission has taken the side of the tech companies with the National Traffic Safety Board supporting the position of the auto industry.
Many have worked on media access protocols, routing, warning message dissemination, and VANET application scenarios.
Other automakers working on V2V include Toyota,[23] BMW, Daimler, Honda, Audi, Volvo and the Car-to-Car communication consortium.
In August 2014, NHTSA published a report arguing vehicle-to-vehicle technology was technically proven as ready for deployment.
[27] On 20 August 2014 the NHTSA published an Advance Notice of Proposed Rulemaking (ANPRM) in the Federal Register,[28] arguing that the safety benefits of V2X communication could only be achieved, if a significant part of the vehicles fleet was equipped.
It aims to assure that ITS applications are interoperable and can operate across national borders, it defines priority areas for secondary legislation, which cover V2X and requires technologies to be mature.
In 2014 the European Commission's industry stakeholder "C-ITS Deployment Platform" started working on a regulatory framework for V2X in the EU.
[38] The other one is to try to minimize the data download time by choosing the right network architecture after analyzing the urban scenario where we want to implement it.