Sorry, I think it is better to paste here instead :P Oh I think my explanation is incomplete. I believe the "spikes in traffic" used here is technical in nature. Usually, "traffic" here means volume of something, usually refers to network data. "Spikes" refer to sudden increase (in those graphs or charts, spikes are lines that are sharp and pointed"). So the entire sentence means: "The plans actually take into consideration of those situations where there are sharp increases of data volume" if we are talking about network traffic here.

这些计划必须考虑到交通的因素。

Oh I think my explanation is incomplete. I believe the "spikes in traffic" used here is technical in nature. Usually, "traffic" here means volume of something, usually refers to network data. "Spikes" refer to sudden increase (in those graphs or charts, spikes are lines that are sharp and pointed"). So the entire sentence means: "The plans actually take into consideration of those situations where there are sharp increases of data volume" if we are talking about network traffic here.

It means that the plans include the factor of those spikes in traffic. "To take into account" means to include the consideration of certain factors