To save manutacturing cost, since it's not required by law in the US to have amber rear turn signals Ford decided to save some money.
>So why doesn't the US Explorer have the same tri-color taillight assemblies,
>with separate amber turn signals, just like the US Windstar and Escape? The
>'95 through '01s did. The taillights on the Australian Explorer look
>*great*---definitely better than the plain stop/tail/turn red lamp on the US >Explorer.