I sort-of disagree with the "start at half of top speed" commenters — the slow start may be the thing that really helps the panicky atmosphere at the end. What I would like to see instead is much harder acceleration until you reach half or 3/4 of top speed.
Of course to really know which is better would require playtesting :-)
 "Accelerator"){kind=icon}
 "Frontier"){kind=icon}
I'm planning on making it an option... so you can choose your start speed up to 100 below your best :)