Access Control is defined as the mechanism of limiting access to a location based on permissions. This has been a staple of the security industry for many years. Traditionally, physical barriers and an identification mechanism, such as a magnetic card reader, would restrict access to authorised personnel. Covid-19 has brought new challenges to many locations, where access needs to be controlled for social distancing, but access is not limited by authorisation. Anyone can enter the location, but only when the location is not too busy. This type of access control is uniquely suited to people-counting.