I am a traffic lawyer and I do not recommend that you hire a lawyer. First, as a lawyer who has actually handled cases in Arlington, Arlington handles their traffic docket differently than just about everywhere else in Virginia. In the vast majority of jurisdictions in Virginia, if you do not have a lawyer, you do not get an opportunity to speak to the prosecutor about a possible plea bargain. Arlington and Prince William County VA are notable exceptions to this policy. So, if you are charged with just the minor traffic infraction of speeding in Arlington, save your money on lawyer's fees and see if you can work it out on your own.
Note- don't confuse a Speeding charge with "Reckless Driving Speeding." Reckless Driving Speeding is usually charged for doing 20+ mph above the speed limit or above 80 mph in any speed limit. Reckless Driving Speeding is a serious criminal charge and I do recommend that you hire a lawyer for Reckless Driving Speeding.