i left this morning at about 515 am, took the maduravoyil bypass to vandalur and got onto NH 45. it was straight onto Trichi on the 45. by passed villipuram and all majore towns on the way. I personally believe this route is better than the madras bangalore GQ. the toll is a LOT more expensive. I paid roughly 300 rupees in toll alone at about 6 toll booths. the 7th was not yet comissioned (just outside trichi) and the 8th is being constructed (outside Vallam near thanjavur).
the road conditions till trichi is awesome, but for some real classical morons who come on the wrong side. one needs to be very cautious about 30kms from trichi where the frequency of the said idiots increase drastically. there is an overpass being constructured between the junction of NH 45 and NH 67. one needs to take the left there and head towards thanjavur.
That stretch is quite bad. 4 laning happening at various points and to get out of trichi town takes patience. once one crosses BHEL then you can put toe foot on the gas and go.
At Vallam (i hope the spelling is correct) you drive through the village, so drive cautiously. flyover work oin the 4 lanes also happening, so just one place where one could get confused, just outside thanjavur. the junction with 45A, 67 and SH 207 (i think)
come to the circle and take the left bend, that takes you to Thanjavur.