In order to access the hazardous materials settings you will need to do a slight change in the application settings (settings.ini).
For Sygic 2D the setting is AdvancedTruck=true
For Sygic 3D the setting is m_bAdvancedTruck=true
Note that with each application settings change it is necessary to delete the settings.dat (settings2.dat) and restart the app in order to apply the changes.
Please check the topic of settings overwrite for easy and sustainable application change.