What is SLEX toll called?

Could you please clarify what you mean by "SLEX toll"? Is it referring to a specific toll road or highway system? If so, could you provide some more context or information about the location or region where this toll road is located? Additionally, are you asking what the official name or designation of the toll fee is called, or perhaps you're wondering about the payment method or process for paying the toll? It would be helpful to have more details to provide an accurate and relevant answer to your question.