 The Rhode Island Department of Transportation ( RIDOT ) has laid out long @-@ term plans for improvements to both the southern and northern termini of Route 4 . During the 1980s and 1990s , RIDOT announced plans to eliminate the three traffic lights along the southern end of the highway . The department planned to replace the existing signalized US 1 and Route 4 merge , converting it into a grade @-@ separated interchange with an extensive overpass . This would cut @-@ off access to three local roads that intersect US 1 near the signal . The plan also included the replacement of the two other signaled intersections at West Allenton Road and Oak Hill Road with overpasses ; the overpass for West Allenton Road is planned to be constructed as a new exit 4 . In the 1990s , the state purchased and demolished several houses in the region to allow for an expanded Route 4 right @-@ of @-@ way in the vicinity of West Allenton Road . 
 The Rhode Island Department of Transportation ( RIDOT ) <a href='been_done' title='1'><mark>has</mark></a> laid out long @-@ term plans for improvements to both the southern and northern termini of Route 4 . During the 1980s and 1990s , RIDOT announced plans to eliminate the three traffic lights along the southern end of the highway . The department planned to replace the existing signalized US 1 and Route 4 merge , converting it into a grade @-@ separated interchange with an extensive overpass . This would cut @-@ off access to three local roads <a href='null_relcl' title='2'><mark>that</mark></a>intersect US 1 near the signal . The plan also included the replacement of the two other signaled intersections at West Allenton Road and Oak Hill Road with overpasses ; the overpass for West Allenton Road is planned to be constructed as a new exit 4 . In the 1990s , the state purchased and demolished several houses in the region to allow for an expanded Route 4 right @-@ of @-@ way in the vicinity of West Allenton Road . 
Da Rhode Island Department of Transportation ( RIDOT ) done laid out long @-@ term plans fa improvements to both the southern and northern termini of Route 4 . durin tda1980s and 1990s , RIDOT announced plans to eliminate the three traffic lights along the southern end of the highway . Thdaepartment planned to replace thedaisting signalized US 1 and Route 4 merge , converting it into a grade @-@ separated interchange with an extensive overpass . This would cut @-@ offf access to three local roads intersect US 1 near the danal . The pda also included the redacement of the 2 other signaled intersections at West Allenton Road and Oak Hill Road with overpasses ; the overpass for West Allenton Road is planned to be constructed as a new exit 4 . In the 1990s , the state copped and demolished several houses in the region to allow for an expanded Route 4 rite @-@ of @-@ way in the vicinity of West Allenton Road .