Set the look-ahead to single signal only mode for the most recently defined style (defined using the <spanclass="code">define_style</span> property).<br/>
This property only makes a difference when the "realistic train braking is aspect limited" game setting is enabled, or when using a different signal
type which uses <spanclass="code">tyle_combined_normal_shunt</span>.<br/>
type which uses <spanclass="code">style_combined_normal_shunt</span>.<br/>
This is similar to <spanclass="code">style_lookahead_extra_aspects</span> with a value of 0, except the lookahead always ends at the
next signal, even if that signal type sets <spanclass="code">style_no_aspect_increase</span>.<br/>
If enabled, this property overrides <spanclass="code">style_lookahead_extra_aspects</span>.<br/>