Is this cracking bad enough to cause a blowout? Steer tires.

Any pics?

 

Is your pic in braille?

 

Your boss should be safe if he isn't the one driving on bad tires.

 

Please show us some pictures of the tires. Unless we see them it's hard to tell.

 

Good pictures. If those tires are on the steer axle get them changed now. Like today.
If they're on the trailer or the drive axle don't run them any further than the next tire shop.
If your boss thinks those tires are okay to run he's either the biggest cheapskate I've ever seen or just plain ignorant.
Let us know how it turns our for you.

 

Those aren't cracks, they're tread. Not much either.