It was observed in the recently concluded 2015 general elections that there was low voters turnout expecially in Lagos and kaduna. There are many reasons for this, one of such reasons according to my little research is migration of the electorates. Many voters have moved away from the area where they registered and were unable to go back and vote on election day thus, contributing to low voters turnout.
Some of my old neighbours had to rent an hotel, now imagine those people without relatives and friends in their old places and also can't afford to get hotel. They'll just remain in their houses and be disfranchised. This is very bad for our democracy as it will leave extremely few people determining for the whole populace and the outcome of such elections might not actually reflects what the people want.

I know this is a big problem and if not properly tackled could encourage rigging.
INEC really need to look into this issue so as not to disfranchise many voters.

Nice observations, I also noticed that.