Mr Stevenson also announced measures to minimise disruption during the construction of the new bridge, including reducingworkinghours for the building of associated roads.
Finally, some of the measures that Joe Geronimo Martinez mentions have been tried all around over decades (esp. reducingworkinghours), with not exactly overwhelming success.
Other costs are the impact on the lives of women and girls who spend several hours every day carrying heavy loads of water thus reducing the time women have available for growing food, working to earn an income or take care of children, and preventing girls from attending school.