The ever present traffic jam does't just get drivers hot under the collar, it seems. New research from France suggests that it also raises the temperature of the driver's
The result is that the heat generated by driving for long periods could reduce male fertility (Hum Reprod, 2000; 15: 1355).
The discovery is nothing new. Several earlier studies found that the wives of men who drive for a living such as long distance lorry drivers, salesmen and taxi drivers took longer to conceive than those whose husbands were deskbound.
So, next time a cab driver asks you for a tip, tell him to walk.