 Delaware Route 1B ( DE 1B ) is a 1 @.@ 11 miles ( 1 @.@ 79 km ) state highway spur of DE 1 that allows access to and from Rehoboth Beach . DE 1B starts at the southern approach to the Lewes and Rehoboth Canal bridge on DE 1 , with right @-@ in / right @-@ out ramps providing access to both directions of DE 1 . From this point , DE 1B heads west from DE 1 as a two @-@ lane undivided road , curving north and passing under the DE 1 bridge over the canal . The route intersects State Road , which provides access to and from the northbound lanes of DE 1 , at which point it heads northeast away from the canal on State Road . DE 1B continues into Rehoboth Beach and passes homes before reaching its terminus at DE 1A . At this intersection , left turns are prohibited from DE 1B to DE 1A northbound . 
