Explained: Why Trailer Number Plates in Kenya Start With the Letter Z

In Kenya, trailer license plates start with the letter Z (e.g., ZA, ZB) on a yellow reflective background with black text, as mandated by the Traffic Act. This rule exists because a trailer has no engine and is a separate legal entity from the hauling truck, requiring its own logbook and insurance. The Z prefix helps traffic police and inspectors instantly identify trailers. Other countries like South Africa (letter T), Tanzania, and Germany use similar systems.