Sam Rayburn Tollway
State Highway 121 Tollway
Route information
Maintained by NTTA
Length	25.2 mi[1][2] (40.6 km)
Existed	2006–present
Major junctions
Southwest end	SH 121 in Lewisville
Major intersections	I-35E / US 77 in Lewisville Dallas North Tollway at Plano-Frisco
Northeast end	US 75 / SH 121 / Spur 399 in McKinney
Location
Country	United States
State	Texas
Highway system
Highways in Texas Interstate US State Toll Loops Spurs FM/RM Park Rec

The Sam Rayburn Tollway (formerly the State Highway 121 Tollway) is a controlled-access toll road operated by the North Texas Tollway Authority^[3] that runs from Grapevine to McKinney. Its frontage roads are signed State Highway 121.

The original portion of the toll road from Business 121 near Coppell to FM 2281 opened in May 2006, and toll collection started December 1 of that year. The tolled portion extended to Hillcrest Road in Plano/Frisco on August 31, 2008. The tollway was extended to Custer Road on September 1, 2009, and again to Hardin Boulevard in McKinney on October 1, 2009.

The tollway (formerly named 121 Tollway) was renamed in honor of Sam Rayburn at a North Texas Tollway Authority meeting on March 16, 2009.

The tollway also currently features two five-level stack interchanges, at Dallas North Tollway and Interstate 35E /US 77.

History

The Sam Rayburn Tollway project was divided into five segments, all of which have been completed.

• Segment 1, from Denton Tap Road to Old Denton Road, opened to traffic in July 2006.
• Segment 2, which runs from Old Denton Road to Hillcrest Road, officially opened to traffic on September 1, 2008, when NTTA took full responsibility for Segments 1 and 2 as well as the operation, maintenance and construction of the remaining segments of the SRT.
• NTTA contractors began work on Segment 3 of the SRT in March 2008. On September 1, 2009, the NTTA opened the main lanes from Hillcrest Road to just east of Custer Road. On September 29, 2009, the NTTA opened the main lanes from just east of Custer Road to west of Hardin Boulevard.
• Segment 4 encompasses the Sam Rayburn Tollway/U.S. 75 interchange, from west of Hardin Boulevard to just east of U.S. 75. Construction on this portion of the corridor began in December 2008. Four major direct-connecting ramps were open to traffic in December 2010. The last two ramps were opened in March 2011.
• The Sam Rayburn Tollway/Dallas North Tollway interchange is referred to as Segment 5. The NTTA began construction on Segment 5 in February 2010. It was completed in 2012.

Exit list

Almost all exits include access to SH 121, which follows the frontage roads. Due to the nearly continuous frontage road, most exits on the Tollway serve more than one roadway. All exits are unnumbered.

County	Location	mi[1]	km	Destinations	Notes
Denton	Lewisville	0.0	0.0	SH 121 south / Bus. SH 121 north – D/FW Airport, Fort Worth, Lewisville	Continues south as SH 121; southern terminus of SH 121 Business
Dallas	Coppell–Lewisville line	0.9	1.4	SH 121 north / Denton Tap Road	No southbound signage for SH 121
Denton	Lewisville	1.6	2.6	Denton Tap Main Lane Gantry
		2.2	3.5	MacArthur Boulevard	Tolled southbound exit and northbound entrance
		3.2	5.1	I-35E (US 77) – Denton, Dallas	Tolled exit to I-35E north; exits 447A-448A on I-35E
		3.5	5.6	SH 121 south / Lake Vista Drive	Southern terminus of SH 121 concurrency; southbound exit and northbound entrance
	Carrollton	4.5	7.2	Marchant Boulevard / Huffines Boulevard
		5.0	8.0	SH 121 north / Hebron Parkway	Northern terminus of SH 121 concurrency; no SH 121 signage southbound
		6.4	10.3	Carrollton Parkway	Tolled northbound exit and southbound entrance
	Lewisville	7.2	11.6	FM 544 (Parker Road)	Tolled northbound exit and southbound entrance; southbound exit is via FM 2281 interchange
		7.8	12.6	FM 2281 (Old Denton Road) – Carrollton	Tolled northbound exit and southbound entrance; also signed for FM 544 southbound
		8.1	13.0	Bus. SH 121 south	No direct northbound exit; northern terminus of SH 121 Business
		8.8	14.2	Standridge Drive / Castle Hills Drive	Tolled interchange
		9.1	14.6	Josey Main Lane Gantry
		9.6	15.4	FM 423 north (Main Street (The Colony)) / Josey Lane (Lewisville)	Tolled interchange; southern terminus of FM 423
	The Colony	10.5	16.9	Paige Road / Plano Parkway	Southbound exit via South Colony Boulevard interchange
		11.2	18.0	South Colony Boulevard / Nebraska Furniture Mart Drive	South Colony Boulevard not accessible northbound; tolled southbound exit and northbound entrance
		12.0	19.3	Spring Creek Parkway	Tolled southbound exit and northbound entrance
Collin	Plano–Frisco line	12.9	20.8	Legacy Drive
		13.0	20.9	Dallas Parkway	Southbound exit is via Parkwood Boulevard interchange
		13.8	22.2	Dallas North Tollway
		14.3	23.0	Parkwood Boulevard	Tolled northbound exit; also signed for Dallas Parkway southbound
		14.9	24.0	SH 289 (Preston Road)
		16.0	25.7	Hillcrest Road (Frisco) / Rasor Boulevard (Plano) / Ohio Drive	Tolled northbound exit and southbound entrance; Ohio Drive signed at SH 289 exit southbound
		17.3	27.8	Coit Road	Tolled northbound exit and southbound entrance; to Centennial Medical Center
		18.4	29.6	Independence Parkway	Tolled northbound exit and southbound entrance
	Plano–Frisco– Allen–McKinney quadripoint	19.6	31.5	FM 2478 (Custer Road)	Tolled northbound exit and southbound entrance; no direct southbound exit (signed at Exchange Parkway)
				Custer Main Lane Gantry
	Allen–McKinney line	20.3	32.7	Exchange Parkway (Allen) / Craig Ranch Parkway (McKinney)	Tolled southbound exit and northbound entrance
		21.2	34.1	Alma Drive (Allen) / Alma Road (McKinney)	Tolled southbound exit and northbound entrance; no direct northbound exit (signed at Exchange Parkway), Alma Drive is signed on the exit sign.
		22.2	35.7	Stacy Road	Tolled southbound exit and northbound entrance
		22.9	36.9	Lake Forest Drive (McKinney) / Watters Road (Allen)	Tolled southbound exit and northbound entrance
		23.8	38.3	Hardin Boulevard (McKinney) / Chelsea Boulevard (Allen)	Tolled southbound exit and northbound entrance
		24.2	38.9	Frontage Road	Northbound exit only; to US 75 frontage roads
		24.5	39.4	US 75 / SH 121 north – Sherman, Dallas	Exit 38C on US 75
		25.2	40.6	To SH 5 / Medical Center Drive	To Medical City McKinney; continues north as Spur 399
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Electronic toll collection       Incomplete access