Not exactly. Mercury vapor lights emit white light, but there are also other types of street lights that are white. For example, fluorescent street lights are white, even though they are seldom used now. Some places also apply metal-halide street lights. But for now, the most possible answer is the LED street light. Because they outperform the other two types, many cities promote their use.
More reading: 7 Types of Street Lights Classified by Light Sources