In Pictures: Hop on to Singapore's bus of the future

Two concept double-decker buses, with new features as USB charging ports, were unveiled at the first Bus Carnival on Friday (March 11). The roving carnival will be held at Ngee Ann City Civic Plaza from March 11-13; at the outdoor plaza at VivoCity from March 25-27; and at the HDB Hub at Toa Payoh from April 1-3. Here's a sneak peek: