80 km/h design-table check
The embedded metric design reference at 80 km/h is 245 m. With 300 m available, the margin is +55 m. Check the governing table and separate marking rules; this example tests lookup and comparison only.
Compare available sight distance with a two-lane highway design reference for overtaking.
The current Green Book passing sight distances are consistent with the MUTCD no-passing zone warrants and field observations of passing on two-lane highways. Where the sight distance available is less than the value required, a no-passing zone should be marked. These are the values to use for design and for marking passing and no-passing zones.
highlighted = current selection.
Passing sight distance applies to two-lane, two-way highways, where drivers overtake slower vehicles using the opposing lane. It is not needed on multilane or divided roads. It governs the marking of passing and no-passing zones and is checked on crest vertical curves and horizontal curves, where the view of oncoming traffic is limited. Where passing sight distance cannot be provided often enough, consider passing lanes or climbing lanes to maintain safety and level of service.
Compare available sight distance with a two-lane highway design reference for overtaking.
Speed km/h; sight distance m.
This is a table lookup for the selected speed, followed by a comparison with available distance. Highway geometric-design distances and regulatory no-passing-zone marking criteria are distinct; this calculation does not authorize a passing manoeuvre or set road markings.
Illustrative inputs for checking the method; these are not project records.
The embedded metric design reference at 80 km/h is 245 m. With 300 m available, the margin is +55 m. Check the governing table and separate marking rules; this example tests lookup and comparison only.
The embedded metric design reference at 100 km/h is 320 m. With 280 m available, the margin is -40 m. Check the governing table and separate marking rules; this example tests lookup and comparison only.
Compare available sight distance with a two-lane highway design reference for overtaking.
Speed km/h; sight distance m. This is a table lookup for the selected speed, followed by a comparison with available distance. Highway geometric-design distances and regulatory no-passing-zone marking criteria are distinct; this calculation does not authorize a passing manoeuvre or set road markings.
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