Express roads in the neighbourhood of the larger conurbations in Switzerland are already today very heavily loaded. Vehicle frequencies are climbing even further, so that an undisturbed traffic flow becomes vital. Very little is required under Winter conditions in particular to bring traffic to a standstill. In such a case the service vehicles of the road department are unable to access and treat the road surface. A system is needed therefore, which can keep the traffic lanes continually clear and safe. The SERSO-PLUS system, developed from the well-tried SERSO experimental installation (Solar Energy recuperation from Road surfaces - in German: Sonnen-Energie-Rueckgewinnung aus Strassen-Oberflächen) offers an environmentally acceptable solution. A SERSO system collects from just beneath the road surface the excess heat from solar warming in Summer and stores it underground in a rock storage volume. The stored heat is then re-used in Winter to control the temperature of the surface. The surface temperature is stabilised just above 0 degree centigrade, thus hindering ice formation and the freezing of compacted snow. In this way de-icing is assured and traffic interruptions to a large extent avoided. Experiences from the operation of SERSO justify this claim. In the climate of central Europe, it is in general possible to extract more heat from the roadbed in Summer than necessary for the following Winter. It has also been confirmed moreover, that SERSO operation brings a significant stabilisation of the road surface temperature throughout the year. This implies that, compared with the standard situation, the maximum temperatures are reduced in Summer and the minimum temperatures raised in Winter, resulting in an extension of the lifetime of the road's bituminous running surface. A SERSO-PLUS installation consists essentially of a collector surface, whose extent corresponds to the traffic lanes, and additionally a variety of heat sources situated in the immediate neighbourhood. All elements of a SERSO-PLUS system must be so conceived as to allow the integration of their construction or installation into the work flow of a road surface replacement programme. The collector components will be installed together with the new roadway and then connected with the remainder of the system and operated outside this area. The technical feasibility of SERSO-PLUS and some energy modelling results are shown. Also shown are the elements of the cost-benefit analysis, employed for establishing the global economics of the system, with an overview of the approach. The benefits considered include reductions of accident costs, of the costs of traffic jams, of maintenance work, of the use of material and equipment and finally the reduction of wear during the Summer leading to extended lifetime. On the other hand, additional and alternative costs are considered. The positive outcome of the economic study has led to a decision to install the system on a heavily loaded section of the Swiss motorway network, due for major renewal.