the reason for poor shoddy work lies in how ministry of roads manages the contractors eg
1. how the contractor is selected/competency/experience for particular road works.
2. contract sum. Can the contract sum allow for good quality materials procurement ?
3. guidance and supervision form roads engineers i.e are the engineers enough and making proper supervision?
In most international contracts eg the chinese contracts, all the above are present hence better quality. If kirinyaga contractors are supervised well, with well funded contracts and employ experienced labour, their roads will be as good as chinese but kickbacks, low govt engineer staffing and poor quality staffing/labour ensures we get lower quality roads.
As Iron Sharpens Iron, So one Man Sharpens Another.