The B1077 road is due to reopen at Westerfield on Monday after Network Rail installed a new level crossing at the site.
Rail engineers had to upgrade the crossing - used by the road from Ipswich to Westerfield village, Witnesham, Asbocking, Helmingham and Debenham - because the rail line is getting busier with more freight trains heading to Felixstowe.
The road has been closed since the end of May although the rail line from Ipswich to Lowestoft and Felixstowe has remained open while the work was carried out.
The upgrade is part of a major improvement to the Felixstowe branch to enable it to carry more trains to and from the port - removing hundreds of lorries a day from the county's roads.
The upgrade work is due to be completed later this year and should allow an extra 10 freight trains a day in each direction to use the Felixstowe branch to the port.
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