Walking and cycling charity Sustrans is launching its third online travel challenge for workplaces   Results from October’s Cymru Travel Challenge reveal that on average, car users can save up to £1,000 a year when they switch from a car commute to cycling or walking.  Walking and cycling charity Sustrans is running its third challenge this July, helping more people in Wales to opt for a healthier mode of transport and saving money as a result.  The challenge is completely…