UNDATED -- The Federal Highway Department's latest document on road signs calls for the replacement of all road signs by 2018. It has cities, townships and counties concerned that they won't be able to afford it.

Cassandra Isackson is the Assistant Traffic Engineer for MnDOT.

She says they have been working with townships to get them up to speed on the rule.

Isackson says it won't be as big of an impact on the state because they already have a sign management program.

MnDOT estimates it will cost the state as a whole up to $76-million to replace the signs but she says the Federal Highway Department is taking comments and could revise the schedule.