A road closure in Bethel starts today.  The Walnut Hill - Hoyt Road construction project is anticipated to last through the end of September.  The Bethel Highway Department says the exact road closures will depend on what phase of the project they are in.  Advisory signs have gone up around the project to use for detours.  Even when the road is open, the highway department is cautioning that there will be delays through the project site.  They are recommending drivers use alternate routes to avoid travel delays.