You are permitted to make an affirmative defense argument in court arguing that your speed was safe for the conditions that were present. But, the burden of proof falls upon YOU in such a case. Because you exceeded the posted limit, and if this was a "business district" with a prima facie limit of 25 MPH, then you are automatically guilty if the judge or commissioner believes you exceeded that speed.
It might be difficult to convince a judge that traveling at 50% over the posted limit was "safe," but, if you can argue a lack of pedestrians, traffic, cross traffic, time of day, visibility, etc. - and the officer has no observations and testimony to refute this - then you MIGHT prevail. It's a long shot.
Keep in mind that if you take the matter to trial you might lose out on the opportunity to attend traffic school and thus mitigate the point on your license (which, if not removed, will almost certainly raise your insurance rates). Many courts do not allow the TS that option available after a court trial, and I have heard very few stories of people being permitted TS after losing a TBWD. But, every court is different.

