Here's what to look out for if you're traveling in the Baltimore metropolitan area this week, based on information from state and local highway agencies and the Mass Transit Administration. The list of highway projects includes only newly announced work, not ongoing construction, which is extensive on several highways, including I-95, U.S. 50/301 and the Baltimore-Washington Parkway. Highway plans are subject to change because of weather and other factors.

New highway projects

Fayette at Liberty/Hopkins Place: closed until tomorrow, 5 a.m. Detour: south on Hopkins Place, west on Lombard Street, north on Paca Street, west on Fayette Street.

Howard Street at Pratt Street: closed until tomorrow, 5 a.m. Detour: south on Howard Street, east on Conway Street, north on Charles Street to Pratt Street.

Madison Street at Cathedral: closed until Tuesday, 3 p.m.

Detour: west on Madison Street, south on Cathedral Street, west on Franklin Street, north on Paca Street to McCulloh Street.

Light-rail construction

* Northbound Park Avenue at Mulberry Street: Park Avenue reduced to one lane by construction.

* Dolphin Street between Howard Street and Mount Royal Avenue now one-way westbound. Traffic coming from south via Martin Luther King Boulevard destined for northbound Jones Falls Expressway continues east to Chase Street, east on Chase to Cathedral Street, then north at the 1100 block of Cathedral to Mount Royal Avenue and the expressway.

Bus route changes

The MTA has scheduled these changes in bus routes for this week. For more information, call 539-5000; TTY for the hearing-impaired, 539-3497.

Light-rail construction

Fayette Street at Howard Street will be closed for construction of the future Central Light Rail Line until 5 a.m. tomorrow. The bus lines will travel the regular route westbound on Fayette to Liberty Street, south on Liberty, south on Hopkins Place, west on Lombard Street, north on Eutaw Street, via regular route.

Nos. 1 (southbound), 2 (eastbound), 5 (southbound), 8 University of Maryland Transit Center (northbound), 11 (northbound), 20 (eastbound), 35 (eastbound), 36 (northbound), 91 (southbound) -- Baltimore Street at Howard Street will be closed for light rail construction from 7 p.m. Friday until 5 a.m. Monday. Southbound No. 1 line service will travel via regular route eastbound on Baltimore Street to Eutaw Street, south on Eutaw, east on Pratt Street, south on Light Street, then via regular route. All other lines will travel via regular route to Baltimore and Eutaw, south on Eutaw, east on Pratt, north on Charles Street to Baltimore, then via regular route.

Temporary diversions

Effective tomorrow, Eutaw Street, between Lombard and Pratt streets, will be closed by construction.

Nos. 10, 19, 27 -- Buses will travel the regular route to Eutaw and Baltimore streets, east on Baltimore, south on Hopkins Place, east on Pratt, then via regular route.

No. 160 -- The line will use the route explained above to Baltimore and Hopkins Place, south on Hopkins Place, south on Sharp Street, west on Conway Street, south on I-395, then via regular route.

Hampton Neighborhood Festival

No. 27 -- On Saturday between 9:30 a.m. and 6 p.m., traffic in Hampton will be rerouted for a festival. Northbound via regular route to Chestnut Avenue and 36th Street, north on Chestnut, west on 37th Street, north on Falls Road, then via regular route. Southbound, via regular route to Falls Road and 37th, east on 37th, south on Chestnut to 36th, then via regular route. For Roland and University service, northbound via regular route to Chestnut and 36th, north on Chestnut, west on 37th, north on Roland Avenue, then via regular route. Southbound, via regular route to Roland and 37th, east on 37th, south on Chestnut, east on 33rd, then via regular route. If it rains, the fair will be held next Sunday from 2 p.m. to 6 p.m.

Highlandtown Merchants Festival

Because of a festival in Highlandtown, the following reroutings will be followed from midnight Saturday until 8 p.m. Sunday.

No. 10 -- Southbound via regular route to eastbound on Eastern Avenue at East Avenue, south on East, east on Fleet Street, north on Haven Street, east on Eastern, then via regular route. Northbound via regular route to westbound on Eastern at Haven, south on Haven, west on Fleet, north on East, west on Eastern, then via regular route.

No. 23 -- Eastbound via regular route to southbound on Grundy at Gough Street, east on Gough, south on Haven, east on Eastern, then via regular route.

Preakness Day reroutings

Pimlico Road between Northern Parkway and Cross Country Boulevard will be made one-way northbound Saturday from 3 p.m. to 8 p.m. for the Preakness.

No. 27 (Rogers Avenue/Reisterstown Plaza Metro stations service) -- Northbound via regular route westbound on Kelly Avenue to Cross Country, west on Cross Country, west on Glen Avenue, south on Park Heights Avenue, west on Northern Parkway, south on Wabash Avenue, east on Eldorado Avenue, then north on the main drive to the designated loading area at the Rogers Avenue Metro station. Buses to the Reisterstown Plaza Metro station will continue via regular route.

After the Preakness, Northern Parkway will be closed to westbound traffic from Falls Road to Belvedere Avenue.

No. 44 (Gwynn Oak Park service) -- Westbound buses will take Northern Parkway to Falls Road, north on Falls Road, west on Kelly, west on Cross Country, west on Glen, south on Park Heights, west on Northern Parkway, then via regular route. Eastbound buses will take Northern Parkway to Preakness Way, east on Northern Parkway to Belvedere, then via regular route.

No. 44 (Brighton service) -- Westbound takes Northern Parkway to Falls Road, north on Falls Road, west on Kelly, west on Cross Country, then via regular route. Eastbound from 9 a.m. to 8 p.m., takes Cross Country to Pimlico Road, east on Cross Country, east on Kelly, south on Falls, east on Northern Parkway, then via regular route.

Preakness shuttle service

The MTA will operate four shuttle bus services to Pimlico racetrack -- from the Rogers Avenue Metro station ($1.10 one-way fare), from the Poly/Western High School parking lot ($1.10 one-way fare), and from the Providence Road and Timonium Park 'n' Ride lots ($2 one way). The Rogers Avenue shuttle will run from 7:50 a.m. to 7:20 p.m. The other shuttles will start at 10 a.m.

Return to regular route

Nos. 2, 5, 8, 20, 35, 36, 91, 140, 150, 160 -- These bus lines will resume regular routes on Baltimore Street between Light and Gay streets instead of diverting to Pratt Street.