Transport for London is currently experimenting new solar-powered, e-paper displays on 4 bus stops. The e-paper display provides real-time information on arrival times, in addition to the traditional route information and general timetables.
The technology has the advantage to accommodate more information than the paper version, and still be more readable. E-paper screens are also more eco-friendly, drawing less power than conventional screens.
This trial will end in autumn, and may lead to the implementation of the technology on other bus stops if it is considered viable. BBC