How does one go about asking a judge to plea guilty to a lesser charge?

I got a 23109C and have court on Friday. The citation occured in November of 07. I have been citation free since then as well. This was my first ticket ever so Im hoping that my spotless record might help me in some way. I would like to plead guilty to a 22350 ( speeding ticket) and have the option of traffic court so this does not show up on my record. Just got a promotion at work that is going to require me to get my class b with a hazmat endorsement. If this shows up im screwed....any info would be greatly appreciated