Why can't National Grid share its trenches with other utilities or at least carry out work at the same time?
Sometimes this can be done. However, there are often reasons why it just isn't possible. For example, it is sometimes the case that pipes and/or cables need to be physically in different places. Or the technology being used means that trenches aren't required for National Grid to carry out the necessary work.
And in the case of gas emergency work, this is not work that has been planned in advance and therefore co-ordination with other Streetworks activity isn't an option. Safety is National Grid's number one priority and if we are called to deal with a gas leak, we must carry out whatever work is necessary as quickly as possible.