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@JaymeeH
They are traditionally Mercury Discharge lamps or LPS/HPS (High or Low Pressure Sodium lamps.) Although they are very efficient the colour range produced is poor for distinguishing colours. Most street lights are still using this type of bulb.
However you see a lot more Metal Halide and Induction Lamps these days as the colour reproduction is much better which has a dramatic effect on drivers peripheral vision. They are a clearer white light but you would recognise them as they are used commercially a lot and for things like football stadium lights.
So maybe these are Xenon lamps or even one of the new LED lamps. However neither is that well suited to street lamp usage. And they are expensive.