Buses are identified with blue bars. There are auto rickshaw which are often used for transportation but blamed for pollution and noise. The evening buzz of Rajpur road is an attraction. The city centre is easily recognised by the Clock tower (Ghanta Ghar), a structure with four functioning clocks. The statue of San Dijen placed in Shanti Niketan contributes to the beauty of the city. Dehradun has been home to artists and writers including Stephen Alter, Nayantara Sahgal, Allan Sealy, Ruskin Bond and also to country singer Bobby Cash.