Orbital space is getting crowded. Traffic in Low Earth Orbit (LEO) is intensifying and diversifying, transforming the domain into a much busier environment. Continued safe and sustainable access and use of orbital space requires the international community to agree on fundamental governance of the most common traffic interactions. In orbit, the most important traffic interactions, conjunctions, are currently essentially unregulated, leaving operators to negotiate collision avoidance manoeuvres on an ad-hoc basis. As in other traffic domains, right-of-way rules establishing priority between vessels are required to ensure safe and efficient governance of conjunctions. This article provides a review of relevant parameters and principles for orbital right-of-way rules.