Grand Prix of Houston promoter Mike Lanigan has spent almost $1 million to improve the temporary street course at Reliant Park after a rough IndyCar return last year.

Lanigan said Friday that $700,000 was spent on safety improvements alone. The fence that Dario Franchitti hit when his car went airborne has been fortified and the grandstands were removed.

Another $300,000 was spent on work to the pavement. Last year, a bump in the track altered the championship race.

IndyCar will run a doubleheader this weekend, with races on Saturday and Sunday. Lanigan hopes the only issue will be the heat, with drivers facing temperatures in the low 90s.