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Updated Jun 4, 2012, 7:35 am

Janet Rose Jackman TucsonSentinel.com

Work on Tucson's Sun Link modern streetcar is continuing with additional traffic closures Downtown and around Fourth Avenue and the University of Arizona.

The Sun Link team and the Tucson bicycling community are suggesting detour routes for bicyclists around the construction, with designated crossing areas while work is going on, said Michael Graham, a spokesman for the city.

The following construction affects motorists for the week of June 4:

Downtown

• Parking will be maintained along Sixth Avenue north and south of the Congress Street intersection.
• On-street parking will not be permitted along Broadway between Granada and Fifth avenues.
• During Congress Street work, there will be intermittent closures of Fifth Sixth avenues at Congress Street.
• Scott Avenue is closed at Congress Street for approximately four months. Access to businesses north and south of the intersection, as well as access to street parking and garages off Scott Avenue, will be maintained.
• Construction on Congress Street includes curb to curb removal of asphalt and major excavation for utility relocations before the roadway is reconstructed with rail. The extensive nature of this work requires full closures 24 hours per day.

Fourth Avenue and University Boulevard

This area of the project includes Fourth Avenue from the Fourth Avenue underpass to University Boulevard, University Boulevard to Main Gate Square, and Park Avenue to Second Street. Traffic control in this area is as follows:

• The contractor will transport additional rail to the Fourth Avenue work site north of Sixth Street on Wednesday. The rail will be moved from an area near 10th Street, north on Third Avenue to Seventh Street, west to Fourth Avenue and north through the intersection of Sixth Street. Several segments of rail will be transported. This activity is planned to take place between 5 a.m. and 7 p.m.
• On-street parking along Third Avenue between 10th and Seventh streets will not be permitted during the above-referenced day and time of rail transport.
• On-street parking along Seventh Street, between Third and Fourth avenues will not be permitted during the above referenced day and time of rail transport.
• On-street parking along Fourth Avenue, between Sixth and Seventh streets will not be permitted during the above referenced day and time of rail transport.
• The contractor will continue working on waterline tie-ins along University Boulevard, between Park and Euclid avenues. Waterline work will begin at 4 a.m.
• The contractor will continue installing track along Fourth Avenue from University Boulevard to Sixth Street. Concrete is scheduled to be delivered at 2 a.m. on Tuesday and Thursday.
• Euclid Avenue at University Boulevard will be reduced to one travel lane in each direction. These temporary lane restrictions allow the contractor to extend sewer and water upgrades through the intersection. The lane restrictions will be in place 24-hours per day through the end of June.
• Left turn movements from westbound Sixth Street to Fourth Avenue are not permitted. Fourth Avenue businesses located south of Sixth Street can be reached by using Third or Fifth avenues.
• Left turn movements from northbound Fourth Avenue to westbound Sixth Street are not permitted.
• Fourth Avenue north of Sixth Street is closed to vehicular and bicycle traffic.
• University Boulevard is closed to vehicular and bicycle traffic between Third  and Euclid avenues and between Euclid and Park svenues. This closure will be in place while the contractor completes the removal of the existing roadway, underground utility work, rail placement and installation of the Overhead Contact System.
• The intersections of University Boulevard with Bean, Second, Jacobus, First avenues and Tyndal will be closed to through traffic.
• Traffic along Third, Euclid and Park avenues will not be affected during this work.
• Sidewalk access will be maintained at all times.
• Fourth Avenue is closed to vehicular and bicycle traffic between 6th Street and University Boulevard. This closure will be in place for approximately four months.
• Pedestrian access along Fourth Avenue will be maintained at all times.

University of Arizona and Health Sciences Center

This area of the project includes Second Street to Warren Avenue, the Warren Avenue underpass and a section of Helen Street that connects to the Health Science Center. Traffic control in this area is as follows:

• The contractor will begin installing water mainline on Cherry Avenue between Speedway Boulevard and Helen Street. This underground utility work will require the closure of Cherry Avenue for approximately three weeks.
• The intersection of Cherry Avenue and Helen Street will remain open throughout most of this work.
• Northbound turn movements from Speedway Boulevard onto Cherry Avenue will not be permitted.
• There will be intermittent restrictions of the westbound Speedway curb lane, between Warren and Vine Avenues during this operation.
• Highland Avenue will be opened to allow northbound vehicular travel between First and Second streets. Motorists exiting the Second Street Garage will use the northbound Highland lanes to depart the area.
• Beginning at 10 p.m. on Wednesday through 4 a.m Thursday, Second Street will be closed between Palm and Highland Avenues. This temporary closure will allow the contractor to install pole foundations for the Overhead Conductor System.
• Second Street will be reduced to one eastbound travel lane only between Palm and Highland avenues.
• The intersection of Cherry Avenue at Second Street is closed. Signs will be in place to direct motorists around the work area. This intersection closure will be in place through the summer.
• Access to the Second Street garage will be maintained.
• Pedestrian access across Second Street near Highland Avenue will be maintained.
• Palm Drive access at Second Street remains open, with easy access from Speedway Boulevard by taking Mountain Avenue to Second Street and heading west to Palm Drive.