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The red circles (and larger crosses) show where problems exist. In many ways, the network is already there - with better signage and supportive mapping, most places are currently reachable from the city centre for reasonably competent cyclists. As the network improves, it becomes more accessible to other cyclists, and eventually anyone can go anywhere at any time.
The biggest single challenge at the moment is getting to and from Ryton. This could be significantly improved if it was made a part of the Section 106 (planning gain) agreement for the Coventry Gateway Project.