Texas State Highway 249

State Highway 249 (SH 249), also known depending on its location as West Mount Houston Road, the Tomball Parkway, Tomball Tollway, MCTRA 249 Tollway, or the Aggie Expressway, is a 49.443-mile (79.571 km) generally north–south highway in Southeast Texas. The southern terminus is in North Houston at Interstate 45 (I-45). The current northern terminus of the highway is east of Navasota at SH 105.

The section of SH 249 along the east–west section between I-45 and West Montgomery is called West Mount Houston Road, a local arterial road. West Mount Houston Road, however, actually extends east past the intersection of SH 249 at I-45 to an intersection with Airline Drive.

The section of SH 249 between West Montgomery Road and Spring Cypress Road is called Tomball Parkway. South of its intersection with Hollister Road, Tomball Parkway is a local arterial road, whereas north of it, it becomes a non-tolled freeway until it reaches Northpointe Boulevard, where the Tomball Tollway begins.

Phase one runs for 6 miles (9.7 km) from just north of Spring Cypress Road, the current terminus of the existing free lanes to just north of the existing Tomball bypass. The Tomball Tollway is three lanes in each direction that are used to bypass seven stoplights and will only accept electronic toll-tags (EZ Tag, TollTag and TxTag) as no cash payments will be allowed; the total cost of the toll for HCTRA's segment is $1.50 for two-axle vehicles, while the SH 249 frontage roads will remain free to all drivers. Construction of phase one began in fall 2013 and was completed on April 12, 2015.

In 1999, a bypass around the central business district of Tomball was proposed that would reroute SH 249 along the west side of the city, this would allow commercial and thru traffic to avoid the downtown and hopefully alleviate traffic. The alignment of SH 249 from Hicks Road to Holderreith Road that went through the city proper was re-designated as SH 249 Business-B on September 25, 2003. Construction of the bypass was delayed many times, but eventually began in 2005 and was completed in 2008. This bypass was eventually incorporated into Phase I of the Tomball Tollway as the free to use frontage roads running alongside the tolled main lanes, as well as the future tolled overpass over FM 2920 which allowed traffic to bypass the light at 249 and 2920. This overpass would not be tolled for several years.

Phase two extends the tollway into Montgomery County from Business SH 249-B to Sentinel Oaks in Montgomery County north of Spring Creek. This $335 million project was overseen by the Harris and Montgomery County toll road authorities. Construction on Phase 2 commenced in fall 2016 and was opened to traffic on December 19, 2019.

From Spring Creek to FM 1774 in Pinehurst, the tolled mainlanes of SH 249 will be maintained by the Montgomery County Toll Road Authority. Signed as MCTRA 249 Tollway, the first section to open was between Spring Creek and Sentinel Oaks (coinciding with Phase two of the HCTRA segment) on December 19, 2019. Construction on the next segment of MCTRA 249 Tollway from Sentinel Oaks to FM 1774 commenced in spring 2018. The next section of MCTRA 249 Tollway opened from Sentinel Oaks to Woodtrace Boulevard on March 26, 2020. The remaining MCTRA segment connecting to the TxDOT maintained section north of Woodtrace Boulevard opened on August 8, 2020. The total cost of the toll for MCTRA's segment is $1.47 for two-axle vehicles and, like HCTRA's Tomball Tollway, will only accept electronic toll-tags (EZ Tag, TollTag and TxTag).

From FM 1774 in Pinehurst to FM 1488 east of Magnolia, the toll road continues as SH 249 Toll, also known as the Aggie Expressway. The tolled main lanes are maintained by TxDOT and were opened on August 8, 2020, with no tolls charged until December 2020. The cost to drive segment 1A is $1.95; however, unlike the HCTRA and MCTRA sections of the toll road, TxDOT allows a pay-by-mail option for all users, though at a higher cost per toll.