280 construction is very difficult.
1. site constraint = better project planning or a super experience project manager is needed coz no extra space for stockpiles construction materials. Need man-make platform for construction.
2. close to existing bridge = Gov will always come kacau to prevent disturb the foundation of existing bridge, hence double or triple works on protecting is needed. Only hydraulic piles jacking is allowed, this method is expensive and slow compare to others method.

so 1 years is nothing for piling is nothing.