Выражение встречается в следующем контексте:
By creating the map digitally in a flexible and generic format this will allow the map to be developed for any application – digital media, print, on-street. The area produced for mapping for the original LL prototype was approximately 1 square kilometre, and give our experience in developing wayfinding systems it is recommended that an area of 2 square kilometres be produced to help with the potential prototype of an on-street system, printed and digital material.
Заранее спасибо

Еще в контексте: We had discussed the fact that you wanted to implement a pedestrian wayfinding scheme on-street in a Moscow pilot area. On-street field survey to gather the necessary data based on an agreed specification. A pilot area must be identified for a first phase of implementation on an on-street system. On-street field survey to gather the necessary data based on an agreed specification.