What is the appropriate speed limit on lower standard expressways?

The appropriate speed limit on lower standard expressways varies depending on specific regulations and traffic conditions, which can differ between regions. Generally, lower standard expressways are designed to accommodate higher speeds compared to conventional roads but are not built to the same specifications as higher-class expressways.

Typically, a speed limit around the range of 80 kph to 90 kph is commonly adopted, as it balances safety with efficiency for vehicles on these types of roads.

The option stating both 80 kph and 90 kph reflects the flexibility that traffic authorities may exercise in setting speed limits based on factors such as road conditions, traffic volume, and safety assessments. These limits allow for differing conditions; for instance, if the traffic is lighter, a higher speed may be permissible, whereas in more congested or hazardous situations, a lower speed might be enforced.

Thus, it's reasonable to conclude that both these limits can be applicable on lower standard expressways, making this selection the most accurate reflection of typical regulations in various jurisdictions.