After looking on a computer I agree it's most likely a keelback. I certainly no longer rely on the chequer pattern after getting a roughy with the check pattern. Both species are common in the logan
Anecdotally, In my area Keelbacks are the most commonly seen snake crossing roads in the month of May. That opinion is formed over 10 years of living in the Brisbane valley.
Surprising in that the numbers of frogs and toads on the same roads is greatly diminished in this time of year.