Blog

5 Mistakes Cities Make When Evaluating Bus Priority Projects

Bus priority projects are among the most cost-effective ways to improve public transit. Compared to widening roads or building new rapid transit infrastructure, measures such as dedicated bus lanes, transit signal priority, queue jumps, and bus stop optimization can often deliver meaningful travel time and reliability improvements with relatively modest investment.

Yet many proposed bus priority projects never move beyond the planning stage—or worse, they are implemented without delivering the expected benefits.

In many cases, the issue isn’t the bus priority measure itself. It’s how the project was evaluated.

Here are five common mistakes cities make when assessing bus priority projects and how to avoid them.

1. Measuring Vehicle Delay Instead of People Movement

One of the most common mistakes is evaluating a corridor based solely on vehicle delay.

A bus carrying 60 passengers is often treated the same as a single-occupant car.

This can lead to decisions that prioritize moving vehicles rather than moving people.

The better question is:

How many people are moving through the corridor?

Bus priority measures may slightly increase travel time for some motorists while significantly reducing travel time for hundreds—or even thousands—of transit passengers. The overall transportation system becomes more efficient even if individual vehicle delays increase slightly.

Successful evaluations consider:

• Person throughput

• Passenger travel time

• Travel time reliability

• Transit accessibility

• Overall corridor performance

 The objective should be to maximize the movement of people, not just vehicles.

2. Looking Only at Average Travel Time

Saving two minutes on average sounds useful.

But for many transit riders, reliability matters even more than speed.

A route that takes 20 minutes every day is often preferable to one that takes anywhere between 15 and 30 minutes depending on congestion.

This is why many transit agencies focus on improving both speed and reliability when implementing bus priority measures. For example, TransLink’s Bus Speed & Reliability program evaluates delay hotspots and measures project success using improvements in travel time consistency as well as average speed.

When evaluating projects, cities should examine:

• Travel time variability

• On-time performance

• Headway regularity

• Bus bunching

• Passenger waiting time

Reliability is often where bus priority delivers its greatest value.

3. Assuming One Treatment Works Everywhere

There is no universal bus priority solution.

A curbside bus lane may work well on one corridor but perform poorly on another.

Transit signal priority may provide substantial benefits at some intersections while offering little improvement elsewhere.

Queue jumps may be effective where short queues create recurring delays, while bus stop consolidation may produce larger benefits on another route.

The appropriate treatment depends on many factors, including roadway geometry, bus frequency, traffic operations, intersection spacing, and surrounding land use. Canadian guidance emphasizes selecting transit priority measures based on corridor-specific conditions rather than applying a one-size-fits-all approach.

Every corridor deserves its own analysis.

4. Ignoring Network Effects

Bus priority projects are often evaluated one intersection or one block at a time.

But transit operates as a network.

Saving 15 seconds at ten consecutive intersections creates a much larger benefit than saving two minutes at a single location.

Similarly, removing one bottleneck can improve schedule adherence across an entire route, reducing delays that compound throughout the day.

Cities should evaluate:

• Entire transit corridors

• Route-wide travel time

• Schedule reliability

• Passenger connections

• Fleet and operating impacts

Thinking beyond individual intersections often reveals benefits that corridor-level analysis would otherwise miss.

5. Focusing Only on Construction Costs

The discussion around bus priority frequently centres on capital cost. Paint. Signs. Signals. Concrete.

But the long-term operational benefits are often much larger.

A faster and more reliable route can:

• Reduce operating costs by improving fleet efficiency

• Improve schedule adherence

• Increase service reliability

• Attract additional riders

• Delay the need for additional buses and operators

Small travel time savings, repeated thousands of times each day, can produce substantial operational and customer benefits over the life of the project.

The best evaluations consider the total value delivered—not simply the upfront construction budget.

Better Questions Lead to Better Projects

Rather than asking:

“Will this bus lane reduce congestion?”

Cities should ask:

• How many people will benefit?

• How much more reliable will transit become?

• What happens across the entire corridor?

• How will this affect transit operations over the next 10 years?

• Is this the highest-value investment for improving mobility?

These questions shift the conversation from infrastructure to outcomes.

Final Thoughts

Bus priority is not about giving buses special treatment.

It’s about making better use of limited road space to move more people, more reliably, and at lower long-term cost.

The most successful projects are those evaluated using a balanced, evidence-based approach—one that considers people, reliability, network performance, and long-term operational benefits alongside traditional traffic metrics.

When cities ask the right questions and evaluate projects with the right measures, bus priority becomes more than a transportation improvement. It becomes a smarter investment in the performance of the entire transportation system.