Honda 2011 Accord making bumping noise today? Is it safe?

I have a Honda 2011 Accord, and just today it was making bumping noises when I was driving. It was most noticeable at low speeds and as I drove on the highway the sound went away, but this is only because the sound gets faster and quicker when the speed is faster as well… It's not a loud noise, but sounds like as if you're constantly driving over a line or small bump in the road. No steering wheel shaking or anything. It was also snowing today and temperature is -2 C if that matters. It went away once I got to work, but worried that it will come back.

Get with your dealer as soon as possible, suspension parts involve, the ball joint may worn out enough and might come loose, lost of steering may result in an accident. I'm not kidding!

Depends on how many miles your car has. You may get the repair under "Good will" (Free of charge or paying part of the cost)

Front suspension noise. Some 2008-12 Accord and 2010-12 Crosstour models may produce a clunking sound from the front end while being driven over rough roads in hot weather.

One likely cause of the noise, says Honda, is the tendency for the grease in the lower ball joint to migrate to the bottom of the joint, especially when hot ambient temperatures are encountered. That creates a slip/stick condition in the ball joint, which is responsible for the clunking noise. Installing new-design lower ball joints (Part No. 51220-TA0-306) should eliminate the condition.

To make the diagnosis, raise the vehicle and allow the suspension to hang freely for a while. That allows the joint to cool and tends to redistribute the grease. Now lower the vehicle and go on a short road test. If the noise is gone, that's your cue that the ball joints are responsible for the ruckus.

Before ordering up a pair of the new ball joints, however, look at the joints that are presently in the car. If they have paint marks on them, the upgraded ball joints are already installed. In that case, replace both of the steering knuckles. Here are the parts specifics for the knuckle assemblies:
Model Part No.
Accord (LH) … 51215-TA0-Y60
Accord (RH) … 51210-TA0-Y60
Crosstour (LH) … 51215-TP6-Y00
Crosstour (RH) … 51210-TP6-Y00

Look at the TSB # 352628 issued by Honda or you can get in touch with your dealer for more information about the problem. Discuss the noise, the TSB and my answer with the Service Manager and who know he might give you a "good will" on the repair. Good luck to you. HTH

Edit: Forget to include the TSB:
http://www.automd.com/tsb/bulletin_b352628/

All TSB for your 2011 Accord:
http://www.automd.com/tsb/honda_m/accord_mm/2011_y/