Two major events are taking over Ottawa streets this weekend, causing many detours for motorists trying to get around the city's downtown core.

Race Weekend has attracted about 30,000 people to the Capital for various runs Saturday and Sunday. The Motorcycle Ride for Dad, which is raising funds and awareness for prostate cancer, is bringing another 1,600 people to the city.

OC Transpo is also advising bus riders to be prepared for delays and trip cancellations as a result of the weekend road closures.

Race Weekend will close Queen Elizabeth Drive from Somerset Street West to the NAC all from 9 a.m. on Friday to 6 p.m. Sunday.

Other major closures for this weekend include:

FRIDAY, MAY 23

Race Weekend closures

Laurier St. off ramp onto Queen Elizabeth Drive closed between 9:00 a.m. Friday to 6:00 p.m. Sunday

SATURDAY MAY 24

Race Weekend Closures

Laurier Ave. (Nicholas St. to Elgin St.) 3:00 p.m. to 9:00 p.m.

Elgin St. (Laurier Ave. to Catherine St.) 6:00 p.m. to 7:00 p.m. cross traffic allowed pre-race

Elgin St. (Laurier Ave. to Wellington St.) 4:30 p.m. to 6:00 p.m. lane Closures

Rideau St. (Elgin St. to Sussex Dr.) 4:30 p.m. to 6:00 p.m. lane closures

Queen Elizabeth Dr. (Preston St. to NAC) 4:00 p.m. to 8:30 p.m.

Colonel By Dr. (Daly St. to Bronson Ave.) 4:00 p.m. to 8:30 p.m. closed from Somerset St. W. to NAC all weekend

Lakeside Ave. 6:00 p.m. to 7:30 p.m.

Bronson Ave. (Lakeside to Colonel By Drive) 4:00 p.m. to 7:30 p.m. lane closures

Motorcycle Ride for Dad closures

The Motorcycle Ride for Dad will also close several streets during a parade of participants between 9 to 11 a.m. Saturday. Police say each of the intersections will reopen after the parade clears.

Ages Dr. - between Legacy St. and Hawthorne Rd.

Hawthorne Rd. - between Ages Dr. and Walkley Rd.

Walkley Rd. - between Hawthorne Rd. and Ramsayville Rd.

Ramsayville Rd. - between Walkley Rd. and Russell Rd.

Russell Rd. - between Baseline Rd. and Anderson Rd.

Anderson Rd. - between Russell Rd. and Innes Rd.

Innes Rd. - between Anderson Rd. and Blair Rd.

Blair Rd. - between Innes Rd. and Ogilvie Rd.

Ogilvie Rd. - between Blair Rd. and Aviation Pkwy.

Aviation Parkway - between Ogilvie Rd. and Rockcliffe Parkway

Rockcliffe Parkway - between Aviation Parkway and Sussex Dr.

Sussex Dr. - between Aviation Parkway and MacKenzie Blvd.

MacKenzie Blvd. - between Sussex Dr. and Wellington St.

Wellington St. - between MacKenzie Blvd. and Ottawa River Parkway

Ottawa River Parkway - between Wellington St. and Carling Ave.

Carling Ave. - between Ottawa River Parkway and Moodie Dr.

Moodie Dr. - between Carling Ave. and the entrance to Nortel

Highway 417 northbound off ramp at Walkley Rd. will be closed between 9:00 a.m. and 9:45 a.m.

Highway 174 eastbound and westbound ramps at Blair Rd. will be closed between 9:15 a.m. and 10 a.m.

SUNDAY MAY 25

Ottawa Race Weekend Closures

Laurier Ave. (Elgin St. to Nicholas Ave.) 5:00 a.m. to 3:00 p.m.

Elgin St. (Lisgar St. to Wellington St.) 5:00 a.m. to 11:30 a.m.

Wellington St. (Chateau Laurier Hotel to Booth St.) 6:30 a.m. to 7:30 a.m. and 8:15 a.m. to 9:00 a.m.

Portage Bridge 6:30 a.m. to 7:40a.m. and 8:30 a.m. to 9:30 a.m. - open all other times

Booth St. northbound (Wellington St. to Gatineau, QC) 6:30 a.m. to 9:30 a.m.

Chaudiere Bridge northbound only 6:30 a.m. to 9:30 a.m. Open at 9:30am to all traffic

Alexandre Tache Blvd. (Eddy St. to Montcalm St.) 6:00 a.m. to 10:00 a.m.

Montcalm St. (T�ch� to St. Joseph Blvd) 6:00 a.m. to 10:00 a.m.

St. Joseph Blvd (Montcalm to Dumas) 6:00 a.m. to 10:15 a.m.

Dumas (St. Joseph to Ducharme) 6:00 a.m. to 10:15 a.m.

St. Redempteur (Ducharme to Charlevoix) 6:00 a.m. to 10:45 a.m.

Charlevoix (St. Repempteur to Eddy) 6:00 a.m. to 10:45 a.m.

Eddy (Charlevoix to Hotel de Ville) 6:00 a.m. to 10:45 a.m.

Hotel De Ville (Eddy to Laurier) 6:00 a.m. to 11:00 a.m.

Laurier St. (Hotel de Ville to St. Laurent) 6:00 a.m. to 11:00 a.m.

Alexandra Bridge 6:30 a.m. to 11:30 a.m. Closed in both directions

MacKenzie Bridge to Wellington St. 6:30 a.m. to 11;45 a.m.

Sussex Dr. (St. Patrick St. to Rockcliffe Pkwy) 6:30 a.m. to 11:45 a.m.

Rockcliffe Pkwy (Sussex Dr. to Aviation Pkway) 6:30 a.m. to 11:45 a.m. Rockcliffe Park Residents north of Mariposa Ave. will be allowed to exit via Rockcliffe Pkwy to Aviation Pkwy

Princess Ave. (Sussex Dr. to Lisgar St.) 6:30 a.m. to 9:45 a.m.

Dufferin Rd at Lisgar 6:30 a.m. to 9:45 a.m.

Mariposa Ave. (Lisgar St. to Cloverdale Rd.) 6:30 a.m. to 10:00 a.m.

Cloverdale Rd (Mariposa Ave. to Hillsdale Rd.) 6:30 a.m. to 10:30 a.m.

Sandridge Rd. (Hillsdale Rd. to St. Laurent Blvd.) 6:30 a.m. to 10:40 a.m.

St. Laurent Blvd. (Sandridge Rd. to Eastbourne Ave.) 6:45 a.m. to 10:45 a.m.

Eastbourne Ave. (St. Laurent to Birch St.) 6:30 a.m. to 11:00 a.m.

Birch Ave. (Eastborne to Hemlock Rd.) 6:30 a.m. to 11:00 a.m. Hemlock Rd. eastbound open to traffic

Hemlock Rd. (Birch St. to Beechwood Ave.) 6:30 a.m. to 11:15 a.m. Beechwood Ave. eastbound open to traffic

Beechwood Ave. (Hemlock Rd. to Mackay St.) 6:30 a.m. to 11:15 a.m.

Mackay St. (Beechwood Ave. to Dufferin Rd.) 6:30 a.m. to 11:30 a.m.

Dufferin Rd (Mackay St. to Stanley St.) 6:30 a.m. to 11:30 a.m.

Stanley St. (Creighton Ave.to Sussex Dr.) 6:30 a.m. to 11:45 a.m.

Colonel By Dr. (Daly St. to Hogs Back Rd.) 6:45 a.m. to 13:15 a.m. Segmented opening possible

Bronson Ave. (Lakeside Dr.to Colonel By Dr.) 6:45 a.m. to 12;30 a.m. Lane closures likely in effect earlier

Lakeside Dr. (Bronson Ave. to Prince Of Wales Dr.) 6:45 a.m. to 12:30 p.m.

Hogs Back Rd. (Colonel By Dr. to Riverside Dr.) 6:45 a.m. to 1:30 p.m.

Riverside Dr. (Heron Rd. to Hogs Back Rd.) 6:45 a.m. to 1:30 p.m. Lane closures likely in effect earlier

Heron Rd. (Riverside Dr. to Prince Of Wales Dr.) 6:45 a.m. to 2:00 p.m.Lane closures likely in effect earlier

Prince of Wales Dr. (Heron Rd. to Preston St.) 6:45 a.m. to 2:30 p.m. Lane closures likely in effect earlier

Queen Elizabeth Dr. (Preston St. to Somerset West St.) 6:45 a.m. to 3:30 p.m. Segmented opening possible