Technologies have been moving fast. Some forklift safety systems use RFID technology, which certainly did wonders for the industry. When it first came out, there were antennas of RFID placed on the pallets so they can be read accurately with content, weight height etc, which kept the chance for theft down to a minimum. It also helped keep delivery and inventory accurate as well. However, applying the technology to moving vehicles like forklifts was good for its time, but was reliant on people wearing a vest or badge for the technology to identify if someone was present. It also relied on hardware being installed, mostly in high traffic areas, in order to identify if a person was around the vehicles. You probably can figure out on your own why this worked pretty good, but has many holes.
Sensors are good as well. Depending on how the sensors are applied to the situation, they can include no to little intelligence. Sensors are only detecting what you want them to detect. So the solutions can range from identifying one thing to having intelligence to include multiple identification tactics.