One worry would be number 6, where it states "the walk area is safe". While there may be nothing in the immediate area in front, something coming in from the side can easily intersect with the person while they are walking forward (a car, a bike, running children). Almost no electronic travel aid ever states something is safe, it would provide information that an area is clear but the user must still make the judgement call.

So Aira without a live agent and more than one camera, although the user could easily just swing their head in the direction they are interested in and that immediately reduces the need for two extra ancillary cameras. Plus the image deciphering system would not be trusted to make appropriate safety decisions such as calling out that the walkway is safe, plus the live agents are trained in image description and alter the level of description on the fly based on the user's needs when using Aira. Will this be lightweight? Weatherproof? How fast are you anticipating the deciphering system to work? What granularity in description will you be building in? Research the market first before diving into this pursuit...Aira, Be My Eyes, SeeingAI, OrcCam to name a few.