The reactor has been sealed recently. Don't know if work has been started to remove the radio active material but if so then there will be more traffic and restricted areas. The area might still be a no-go but from what I understand you have to stick to the roads and there is some exposure and decontamination protocols to adhere. If you search the net there is a girl on a Black Bird that visited the place and written a blog. Anyway, it wouldn't hurt going there. You can ride through to Belarus in the exclusion zone and then head west to pick up the motorway at Warsaw if time is tight.