I'm on-call at work every 2 or 3 weekends. I got called once, and since my wife was out in the car; I told Plant Assistant that I would be there in about 35 minutes. He told me to call a cab, and I'd be reimbursed. I was at the plant 1-1/2 hours later. Nowadays, when called in on an emergency, I don't even mention the fact that I'm bicycling. I just do it.