If one lane is closing then more cars are going to have to fit in fewer lanes. Help increase safety by posting a sign to notify drivers of the closing lane. Don't let it be a surprise.
Standard: 01 In dropped lane situations, regulatory signs (see Section 2B.20) shall be used to inform road users that a through lane is becoming a mandatory turn lane. The W4-2, W9-1, and W9-2 signs shall not be used in dropped lane situations.