Lights used in shipping installations are the same as in traffic-control installations, although there are some differences as is shown below.

Shipping signs	Traffic control installations
Continuous power on	Intermittent operation
Response times less important	Very short response times
Low level intensity required	Less need for low intensity
Red light safeguard preferable	Red light safeguard mandatory
High humidity levels above water	No excessive dampness
Accessibility sometimes difficult	No problems in accessibility
Lights double equipped	Single equipped
Conflict monitoring not required	Conflict monitoring compulsory
No conformation to EN standard	Has to comply to EN 12368 standard
No KEMA approval necessary	KEMA approval obligatory