Directional arrows

Can the massed knowledge here offer any comment on the subject of arrows on directional signs. Which way should an arrow meaning 'ahead' point? The intuitive answer seems to be that an 'ahead' arrow should point upwards, but what about a suspended sign that one passes beneath - an upwards pointing arrow seems wrong unless people are being instructed to vault over the sign (unlikely and probably inadvisable). The standard texts that I consult seem strangely reticent on the subject.

Do any of you have opinions on the subject, or can you point me to writers or research?

Thanks / Andrew

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