CHARLOTTE — Detailed security plans for the Democratic National Convention will surely impact business deliveries, yet some business owners still have no idea to what extent that will happen.

Companies that bring supplies to Center City businesses say they have a lot to figure out in a few short weeks. Zippy Ice owner Howard Mackie is trying to make sense of the security and traffic plans for next month's Democratic National Convention.

"We're just looking forward to seeing what really unfolds," said Mackie.

Mackie delivers ice to dozens of customers in Uptown Charlotte, including many inside secure zones where vehicle traffic is limited. Police want all deliveries to happen between midnight and 6 a.m. during the convention.

"That totally changes our work requirements and needs. We generally don't do mass deliveries overnight," said Mackie.

Tar Heel Linen Service, which brings tablecloths and napkins to uptown restaurants and hotels, also heard about overnight delivery schedules.

"We can do that. Problem is, will our clients be there?” said General Manager Doug Pritchett.

The company has clients in the heart of center city, including some within a couple blocks of Time Warner Cable Arena.

"We have to be down there quite a bit during the week, especially with our larger customers," said Pritchett.

However managers remain uncertain on how to deliver to those clients, saying the traffic plans are confusing and the Secret Service will not reveal specifics.

“We really don't know what to expect," said Pritchett.

Law enforcement could setup a controlled area to search delivery trucks during that overnight window. Mackie said he will try to get to customers as quickly as possible.