Scheveningen is well reached by car or public transport. You travel in less then 15 minutes from the centre of The Hague to the beach of Scheveningen. To get to Scheveningen by car follow highways: A4, A12, A13 or the A44.
During winter Scheveningen can easily be reached by car. In summer take in account that there will be a lot more traffic. If you do not want to stand in a traffic jam take public transport.